Publications of Yannis Tzitzikas

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All Publications of Yannis Tzitzikas (in reverse chronological order)

2021

1. E. Maliaroudakis, K. Boland, S. Dietze, K. Todorov, Y. Tzitzikas, and P. Fafalios,
   ClaimLinker: Linking Text to a Knowledge Graph of Fact-checked Claims,
   Companion Proceedings of the Web Conference 2021 (ACM WWW'2021), Ljubljana, Slovenia, April 19-23, 2021
2. K. Petrakis, G. Samaritakis, T. Kalesios, E. Garcia Domingo, A. Delis, Y. Tzitzikas, M. Doerr and P. Fafalios,
   Digitizing, Curating and Visualizing Archival Sources of Maritime History: the case of ship logbooks of the nineteenth and twentieth centuries,
   Drassana, Journal of the Barcelona Maritime Museum, 28, 2021
3. Emmanouil Smyrnakis, Katerina Papantoniou, Panagiotis Papadakos and Yannis Tzitzikas,
   Chattack: A Gamified Crowd-sourcing Platform for Tagging Deceptive & Abusive Behaviour,
   Demo paper at ECIR 2021.
4. Maria-Evaggelia Papadaki, Nicolas Spyratos and Yannis Tzitzikas,
   Towards Interactive Analytics over RDF Graphs,
   (special issue Algorithmic Data Management), MDPI, 2021
5. Michalis Mountantonakis and Yannis Tzitzikas,
   Cross-Dataset Identity Reasoning for Producing URI Embeddings over Hundreds of RDF Datasets,
   International Journal of Metadata, Semantics and Ontologies, accepted for publication, Dec 2020

2020

1. Christos Nikas, Pavlos Fafalios and Yannis Tzitzikas,
   Two-stage Semantic Answer Type Prediction for Question Answering using BERT and Class-Specificity Rewarding,
   SeMantic AnsweR Type prediction (SMART) Challenge, 2020 International Semantic Web Conference (ISWC'2020) Challenge, Nov 2020.
2. Kostas Manioudakis and Yannis Tzitzikas,
   Faceted Search with Object Ranking and Answer Size Constraints,
   ACM Transactions on Information Systems (accepted for publication) Sept. 2020
3. Y. Marketakis, Y. Tzitzikas, A. Gentile, B. van Niekerk and M. Taconet,
   On the Evolution of Semantic Warehouses: The Case of Global Record of Stocks and Fisheries,
   14th Metadata and Semantics Research Conference (MTSR 2020), Nov 2020.
4. Yannis Tzitzikas, Marios Pitikakis, Giorgos Giakoumis, Kalliopi Varouha and Eleni Karkanaki,
   How Can a University Take its First Steps in Open Data?,
   14th Metadata and Semantics Research Conference (MTSR 2020), Nov 2020.
5. Yannis Tzitzikas and Yannis Marketakis,
   Reinforcing Fisheries Management through Semantic Data Integration,
   ERCIM News, No 123, Oct 2020
6. C. Nikas, G. Kadilierakis, P. Fafalios and Y. Tzitzikas,
   Keyword Search over RDF: Is a Single Perspective Enough?,
   Big Data and Cognitive Computing, 4(3), Special Issue Semantic Web Technology and Recommender Systems, August 2020
7. K. Papantoniou and Y. Tzitzikas,
   NLP for the Greek Language: A Brief Survey,
   Proceedings of the 11th Hellenic Conference on Artificial Intelligence (SETN 2020), Athens, Greece, Sept 2020
8. M. Mountantonakis and Y. Tzitzikas,
   LODsyndesisIE: Entity Extraction from Text and Enrichment using Hundreds of Linked Datasets,
   (Demo Paper), Proceedings of the 17th Extended Semantic Web Conference (ESWC'2020), June 2020, Heraklion, Crete
9. G. Kadilierakis, C. Nikas, P. Fafalios, P. Papadakos, Y. Tzitzikas,
   Elas4RDF: Multi-perspective Triple-centered Keyword Search over RDF using Elasticsearch,
   (Demo Paper), Proceedings of the 17th Extended Semantic Web Conference (ESWC'2020), June 2020, Heraklion, Crete
10. G. Kadilierakis, P. Fafalios, P. Papadakos, Y. Tzitzikas,
    Keyword search over RDF using Document-Centric Information Retrieval Systems,
    Proceedings of the 17th Extended Semantic Web Conference (ESWC'2020), June 2020, Heraklion, Crete
11. M. Mountantonakis and Y. Tzitzikas,
    Content-based Union and Complement Metrics for Dataset Search over RDF Knowledge Graphs,
    ACM Journal of Data and Information Quality, (accepted for publication 2019)
12. E. Dimitrakis, K. Sgontzos, M. Mountantonakis, Y. Tzitzikas,
    Enabling Efficient Question Answering over Hundreds of Linked Datasets,
    Post-Proceedings of the 13th International Workshop on Information Search, Integration, and Personalization (ISIP'2019),
    May 9-10, 2019, Heraklion, Greece, Published 2020
13. ME Papadaki, Y. Tzitzikas, N. Spyratos,
    Analytics over RDF Graphs,
    Post-Proceedings of the 13th International Workshop on Information Search, Integration, and Personalization (ISIP'2019),
    May 9-10, 2019, Heraklion, Greece, Published 2020

2019

1. P. Fafalios and Y. Tzitzikas,
   Answering SPARQL Queries on the Web of Data through Zero-Knowledge Link Traversal,
   SIGAPP Applied Computing Review, 19(3), November 2019
2. E. Dimitrakis, K. Sgontzos and Y. Tzitzikas,
   A Survey on Question Answering over Linked Data and Documents,
   Journal of Intelligent Information Systems, DOI: 10.1007/s10844-019-00584-7 (accepted for publication, Oct 2019)
3. Γιάννης Τζίτζικας και Γιάννης Μαρκετάκης
   Αποσυνθέτοντας το Πρόβλημα της Ψηφιακής Διατήρησης με Μοτίβα,
   25ο Πανελλήνιο Συνέδριο Ακαδημαϊκών Βιβλιοθηκών, Ρέθυμνο, Οκτώβριος 2019
4. M. Mountantonakis and Y. Tzitzikas,
   Large Scale Semantic Integration of Linked Data: A Survey,
   ACM Computing Surveys, 52(5), Sept. 2019
5. M. Mountantonakis and Y. Tzitzikas,
   Knowledge Graph Embeddings over Hundreds of Linked Datasets,
   13th Metadata and Semantics Research Conference (MTSR 2019), Rome, Italy, Oct 2019
6. K. Manioudakis and Y. Tzitzikas,
   Extending Faceted Search with Automated Object Ranking,
   13th Metadata and Semantics Research Conference (MTSR 2019), Rome, Italy, Oct 2019
7. K. Papantoniou and Y. Tzitzikas,
   CS563-QA: A Collection for Evaluating Question Answering Systems ,
   arXiv:1907.01611, [cs.CL], coRR, 2019
8. N. Braunschweiler, P. Papadakos, M. Kotti,Y. Marketakis, and Y. Tzitzikas,
   Crowd-sourced Collection of Task-Oriented Human-Human Dialogues in a Multi-Domain Scenario,
   22nd International Conference on TEXT, SPEECH and DIALOGUE (TSD 2019), Ljubljana, Slovenia, Sept. 2019
9. M. Psaraki and Y. Tzitzikas,
   CPOI: A Compact Method to Archive Versioned RDF Triple-Sets,
   arXiv:1902.04129 [cs.DB], coRR, 2019
10. Y. Tzitzikas, Y. Marketakis, N. Minadakis, M. Mountantonakis, L. Candela, F. Mangiacrapa, P. Pagano, C. Perciante, D. Castelli, M. Taconet, A. Gentile and G. Gorell,
    Methods and Tools for Supporting the Integration of Stocks and Fisheries,
    Chapter in Information and Communication Technologies in Modern Agricultural Development, Springer, 2019.
11. P. Fafalios and Y. Tzitzikas
    How Many and What Types of SPARQL Queries can be Answered through Zero-Knowledge Link Traversal?,
    Procs of the 34th ACM Symposium on Applied Computing (SAC 2019), Limassol, Cyprus, April 2019

2018

1. Yannis Tzitzikas and Yannis Marketakis,
   Cinderella's Stick - A Fairy Tale for Digital Preservation
   Springer 2018, ISBN 978-3-319-98487-2, pp. 1-249
   springer amazon, Book's website with extra material!
2. M. Mountantonakis and Y. Tzitzikas,
   LODsyndesis: Global Scale Knowledge Services,
   MDPI Heritage 1(2), Special issue On Provenance of Knowledge and Documentation: Selected Papers from "CIDOC 2018", 2018
3. M. Mountantonakis and Y. Tzitzikas,
   High Performance Methods for Linked Open Data Connectivity Analytics,
   Information Open Access Journal of Information Science (ISSN 2078-2489), 9, 134, MDPI (Special Issue Semantics for Big Data Integration), 2018
4. M. Mountantonakis and Y. Tzitzikas,
   LoDsyndesis: the biggest Knowledge Graph of the Linked open Data Cloud that Includes all Inferred Equivalence Relationships,
   ERCIM News No. 114, July 2018
5. M. Mountantonakis and Y. Tzitzikas,
   Scalable Methods for Measuring the Connectivity and Quality of Large Numbers of Linked Datasets,
   ACM Journal of Data and Information Quality (JDIQ), 9(3), 15, 2018
6. T. Yannakis, P. Fafalios and Y. Tzitzikas
   Heuristics-based Query Reordering for Federated Queries in SPARQL 1.1 and SPARQL-LD,
   2nd Workshop on Querying the Web of Data QuWeDa'2018 (co-located with ESWC'2018), Heraklion, Crete, Greece, June 2018
7. E. Dimitrakis, K. Sgontzos, P. Papadakos, Y. Marketakis, A. Papangelis, Y. Stylianou, and Y. Tzitzikas
   On Finding the Relevant User Reviews for Advancing Conversational Faceted Search,
   4th Workshop on Sentic Computing, Sentiment Analysis, Opinion Mining, and Emotion Detection at ESWC2018, Heraklion, Greece, 2018
8. A. Papangelis, P. Papadakos, N. Braunschweiler, Y. Stylianou, Y. Marketakis, and Y. Tzitzikas,
   Information Navigation via Spoken Dialogue and Linked Data,
   Demo at ICASSP'18, IEEE International Conference on Acoustics, Speech and Signal Processing, 2018
9. ME Papadaki, P. Papadakos, M. Mountantonakis, Y. Tzitzikas,
   An Interactive 3D Visualization for the LOD Cloud,
   International Workshop on Big Data Visual Exploration and Analytics (BigVis'2018 at EDBT/ICDT 2018), Vienna, Austria, March 2018 (system: www.ics.forth.gr/isl/3DLod/ )
10. M. Mountantonakis, N. Minadakis, Y. Marketakis, P. Fafalios, Y. Tzitzikas,
    Connectivity, Value and Evolution of a Semantic Warehouse,
    Book chapter in "Innovations, Developments, and Applications of Semantic Web and Information Systems", IGI Global, 2018
11. A. Kokolaki and Y. Tzitzikas,
    Facetize: An Interactive Tool for Cleaning and Transforming Datasets for Facilitating Exploratory Search ,
    CoRR abs/1812.10734, 2018

2017

1. P. Fafalios and Y. Tzitzikas,
   Stochastic Re-Ranking of Biomedical Search Results based on Extracted Entities,
   Journal of the Association for Information Science and Technology (JAIST), 68(11), 2017
2. P. Lionakis and Y. Tzitzikas
   PFSgeo: Preference-enriched Faceted Search for Geographical Data,
   16th International Conference on Ontologies, Databases, and Applications of Semantics (ODBASE), October 2017, Rhodes, Greece
3. A. Papangelis, P. Papadakos, M. Kotti, Y. Stylianou, Y. Tzitzikas, D. Plexousakis,
   LD-SDS: Towards an Expressive Spoken Dialogue System based on Linked-Data,
   Proceedings of the Search Oriented Conversational AI, SCAI 17 Workshop, Co-located with ICTIR 17, 2017
4. M. Mountantonakis and Y. Tzitzikas
   Services for Large Scale Semantic Integration of Data,
   ERCIM News 2017 (111), October 2017
5. M. Mountantonakis and Y. Tzitzikas
   How Linked Data can aid Machine Learning-based Tasks,
   21st International Conference on Theory and Practice of Digital Libraries (TPDL), September 2017, Thessaloniki, Greece
6. Y. Tzitzikas, Y. Marketakis, N. Minadakis, M. Mountantonakis, L. Candela, F. Mangiacrapa, P. Pagano, C. Perciante, D. Castelli, M. Taconet, A. Gentile, G. Gorelli
   Towards a Global Record of Stocks and Fisheries,
   8th International Conference on Information and Communication Technologies in Agriculture, Food & Environment (HAICTA), Sept. 2017, Chania, Crete, Greece
7. Y. Tzitzikas and E. Dimitrakis
   Preference-enriched Faceted Search for Voting Aid Applications,
   IEEE Transactions on Emerging Topics in Computing (accepted for publication).
8. C. Lantzaki, P. Papadakos, A. Analyti, Y. Tzitzikas,
   Radius-aware Approximate Blank Node Matching using Signatures,
   International Journal on Knowledge and Information Systems (KAIS), 50(2), 505-542, 2017
9. Y. Tzitzikas, N. Manolis and P. Papadakos,
   Faceted Exploration of RDF/S Datasets: A Survey,
   Journal of Intelligent Information Systems (JIIS), 2017, 48: 329. doi:10.1007/s10844-016-0413-8
10. Μ. Μουνταντωνάκης και Γ. Τζίτζικας,
    Μετρώντας το Πλέγμα των Κοινών Στοιχείων μεταξύ πολλών Διασυνδεδεμένων Συνολοδεδομένων,
    15th Hellenic Data Management Symposium (HDMS'2017), August 2017, Athens, Greece

2016

1. Γιάννης Τζίτζικας,
   Μια Γεύση από Java,
   ISBN 978-960-93-8505-3, Leanpub, Oct 2016
2. M. Mountantonakis and Y. Tzitzikas,
   On Measuring the Lattice of Commonalities Among Several Linked Datasets ,
   42nd International Conference on Very Large Data Bases (VLDB'16), New Delhi, India, September 5-9, 2016
3. M. Mountantonakis, N. Minadakis, Y. Marketakis, P. Fafalios, Y. Tzitzikas,
   Quantifying the Connectivity of a Semantic Warehouse and Understanding its Evolution over Time , International Journal on Semantic Web and Information Systems (IJSWIS), 12(3): 27-78 (2016)
4. P. Fafalios, T. Yannakis and Y. Tzitzikas,
   Querying the Web of Data with SPARQL-LD ,
   20th International Conference on Theory and Practice of Digital Libraries (TPDL'16), Hannover, Germany, September 5-9, 2016
5. Y. Tzitzikas, N. Bailly, P. Papadakos, N. Minadakis, G. Nikitakis,
   Using preference-enriched faceted search for species identification IJMSO 11(3): 165-179 (2016)
6. Y. Tzitzikas, C. Allocca, C. Bekiari, Y. Marketakis, P. Fafalios, M. Doerr, N. Minadakis, T. Patkos and L. Candela,
   Unifying Heterogeneous and Distributed Information about Marine Species through the Top Level Ontology MarineTLO ,
   Program, Vol. 50 Iss: 1, pp.16 - 40, Electronic library and Information Systems, Special Issue on Application of Metadata and Semantics in Science (2016), Emerald (ISSN: 0033-0337).
7. P.Papadakos and Y Tzitzikas,
   Comparing the effectiveness of intentional preferences versus preferences over specific choices: a user study, Int. J. Information and Decision Sciences, Vol. 8, No. 4, 2016

2015

1. P. Fafalios and Y. Tzitzikas,
   Entity-based Stochastic Analysis of Search Results for Query Expansion and Results Re-Ranking ,
   Text Retrieval Conference (TREC'15), Gaithersburg, Maryland, USA, November 2015
2. P. Fafalios and Y. Tzitzikas,
   SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data ,
   14th International Semantic Web Conference (demo paper), ISWC 2015, Bethlehem, Pennsylvania, USA, October 11-15, 2015.
3. Yannis Tzitzikas, Nicolas Bailly, Panagiotis Papadakos, Nikos Minadakis, George Nikitakis,
   Species Identification Through Preference-Enriched Faceted Search.
   9th Metadata and Semantics Research Conference (MTSR '15), Manchester, UK, September 2015.
4. P. Fafalios, M. Baritakis and Y. Tzitzikas
   Exploiting Linked Data for Open and Configurable Named Entity Extraction,
   International Journal on Artificial Intelligence Tools, Vol. 24, No. 02 (2015), World Scientific (ISSN: 1793-6349).
5. Pavlos Fafalios and Yannis Tzitzikas,
   Type-ahead exploratory search through typo and word order tolerant autocompletion ,
   Journal of Web Engineering, Vol. 14, No. 1 & 2 (2015), pp. 080-116, Rinton Press (ISSN: 1540-9589).
6. Y. Tzitzikas, Y. Kargakis, Y. Marketakis,
   Assisting Digital Interoperability and Preservation through Advanced Dependency Reasoning ,
   International Journal on Digital Libraries (Special Issue on Semantic Digital Archives), 15(2-4): 103-127 (2015)
7. Myron Papadakis and Yannis Tzitzikas,
   Answering Keyword Queries through Cached Subqueries in Best Match Retrieval Models ,
   Journal of Intelligent Information Systems, 44(1): 67-106 (2015)

2014

1. P. Fafalios, P. Papadakos and Y. Tzitzikas,
   Enriching Textual Search Results at Query Time using Entity Mining, Linked Data and Link Analysis, ,
   International Journal of Semantic Computing, Vol. 08, No. 04 (2014), World Scientific (ISSN: 1793-7108).

2. Christos Strubulis, Giorgos Flouris, Yannis Tzitzikas, Martin Doerr,
   A case study on propagating and updating provenance information using the CIDOC CRM ,
   Int. J. on Digital Libraries 15(1): 27-51 (2014)
3. Pavlos Fafalios and Yannis Tzitzikas,
   Exploratory Professional Search through Semantic Post-Analysis of Search Results , Professional Search in the Modern World, Lecture Notes in Computer Science, Vol. 8830 (2014), Springer (ISBN: 978-3-319-12510-7).
4. P. Fafalios and Y. Tzitzikas,
   Post-Analysis of Keyword-based Search Results using Entity Mining, Linked Data and Link Analysis at Query Time ,
   IEEE 8th International Conference on Semantic Computing (ICSC'14), Newport Beach, California, USA, June 2014

5. P. Fafalios, M. Baritakis and Y. Tzitzikas,
   Configuring Named Entity Extraction through Real-Time Exploitation of Linked Data ,
   4th International Conference on Web Intelligence, Mining and Semantics (WIMS'14), Thessaloniki, Greece, June 2014

6. M. Mountantonakis, C. Allocca, P. Fafalios, N. Minadakis, Y. Marketakis, C. Lantzaki and Y. Tzitzikas,
   Extending VoID for Expressing the Connectivity Metrics of a Semantic Warehouse ,
   1st International Workshop on Dataset Profiling & Federated Search for Linked Data (PROFILES'14), in conjunction with the 11th Extended Semantic Web Conference (ESWC'14), Anissaras Hersonissou, Crete, Greece, May 2014

7. C. Lantzaki, T. Yannakis, Y. Tzitzikas, and A. Analyti,
   Generating Synthetic RDF Data with Connected Blank Nodes for Benchmarking ,
   11th Extended Semantic Web Conference (ESWC'14), Anissaras, Heraklion, Greece, May 2014

8. Y. Tzitzikas, N. Minadakis, Y. Marketakis, P. Fafalios, C. Allocca, N. Mountantonakis and I. Zidianaki,
   MatWare: Constructing and Exploiting Domain Specific Warehouses by Aggregating Semantic Data ,
   11th Extended Semantic Web Conference (ESWC'14), Anissaras, Heraklion, Greece, May 2014.

9. I. Kitsos, K. Magoutis and Y. Tzitzikas,
   Scalable Entity-based Summarization of Web Search Results using MapReduce ,
   Journal on Distributed and Parallel Databases (DAPD), 32(3): 405-446 (2014)
10. Y. Tzitzikas, M. Kampouraki and A. Analyti,
    Curating the Specificity of Ontological Descriptions under Ontology Evolution ,
    Journal on Data Semantics 3(2): 75-106 (2014)
11. Michail Salampasis, Yannis Tzitzikas,
    Report on the 3rd MUMIA Training School on Information Retrieval and Interactive Information Access July 21-25, 2014, FORTH, Heraklion, Crete, Greece ,
    SIGIR Forum 48(2): 111-115 (2014)
12. Y. Tzitzikas, N. Minadakis, Y. Marketakis, P. Fafalios, C. Alloca and N. Mountantonakis,
    Quantifying the Connectivity of a Semantic Warehouse ,
    4th International Workshop on Linked Web Data Management, LWDM'14 (@EDBT 2014), Athens, Greece, March 2014.
13. P. Papadakos, and Y. Tzitzikas,
    Hippalus: Preference-enriched Faceted Exploration ,
    In ExploreDB '14: Proceedings of the 1st International Workshop on Exploratory Search in Databases and the Web Co-located with EDBT/ICDT 2014, Athens, Greece, March 2014.
14. Y. Tzitzikas, C. Allocca, C. Bekiari, Y. Marketakis, P. Fafalios and N. Minadakis,
    Ontology-based Integration of Heterogeneous and Distributed Information of the Marine Domain ,
    ERCIM News 2014 (96), Special theme: Linked Open Data, January 2014
15. Y. Kargakis, Y. Tzitzikas and Renι van Horik,
    Epimenidis: Interoperability Reasoning for Digital Preservation ,
    11th International Conference on Preservation of Digital Objects (iPRES 2014), Melbourne, Australia, October 2014.
16. Yannis Kargakis and Yannis Tzitzikas,
    Epimenides: An Information System offering Automated Reasoning for the Needs of Digital Preservation ,
    Demo paper, Digital Libraries 2014, ACM/IEEE Joint Conference on Digital Libraries (JCDL 2014), London, UK, September 2014
17. Christina Lantzaki, Yannis Tzitzikas,
    Tasks that Require, or can Benefit from, Matching Blank Nodes ,
    CoRR abs/1410.8536 (2014)

2013

1. Y. Tzitzikas and P. Papadakos,
   Interactive Exploration of Multidimensional and Hierarchical Information Spaces with Real-time Preference Elicitation ,
   Journal FUNDAMENTA INFORMATICAE 122(4): 357-399 (2013)
2. Yannis Tzitzikas, Carlo Allocca, Chryssoula Bekiari,Yannis Marketakis, Pavlos Fafalios, Martin Doerr, Nikos Minadakis, Theodore Patkos and Leonardo Candela,
   Integrating Heterogeneous and Distributed Information about Marine Species through a Top Level Ontology ,
   7th Metadata and Semantics Research Conference (MTSR 2013), November 2013, Thessaloniki
3. Pavlos Fafalios, Yannis Tzitzikas,
   X-ENS: Semantic Enrichment of Web Search Results at Real-Time ,
   Demo, Proceedings of at 36th ACM SIGIR Conference (SIGIR'13), July 2013, Dublin, Ireland
4. P. Fafalios, M. Salampasis and Y. Tzitzikas,
   Exploratory Patent Search with Faceted Search and Configurable Entity Mining ,
   Proceedings of the 1st International Workshop on Integrating IR technologies for Professional Search (at ECIR 2013). March 2013, Moscow, Russia
5. A. Riddick, H. Glaves, F. Marelli, M. Albani, C. Tona, Y. Marketakis, Y. Tzitzikas, R. Guarino, D. Giaretta, U.Di Giammatteo,
   The SCIDIP-ES project-towards an international collaboration strategy for long term preservation of earth science data ,
   EGU (European Geosciences Union), General Assembly Conference Abstracts, April 2013, Vienna, Austria.
6. A. Riddick, H. Glaves, F. Marelli, M. Albani, C. Tona, Y. Marketakis, Y. Tzitzikas, R. Guarino, D. Giaretta, U. Di Giammatteo,
   SCIDIP-ES - A science data e-infrastructure for preservation of earth science data ,
   EGU (European Geosciences Union), General Assembly Conference Abstracts, April 2013, Vienna, Austria.
7. Yannis Tzitzikas
   A Simple Method to Produce Algorithmic MIDI Music based on Randomness, Simple Probabilities and Multi-Threading ,
   CoRR abs/1312.4014 (2013)

2012

1. Y. Tzitzikas, C. Lantzaki and D. Zeginis,
   Blank Node Matching and RDF/S Comparison Functions ,
   Proceedings of the 11th International Semantic Web Conference (ISWC'12), Nov 2012, Boston, USA.
2. C. Lantzaki, Y. Tzitzikas and D. Zeginis,
   Demonstrating Blank Node Matching and RDF/S Comparison Functions ,
   Demo at the 11th International Semantic Web Conference (ISWC'12), Nov 2012, Boston, USA.
3. P. Papadakos, Y. Tzitzikas and D. Zafeiri,
   An Interactive Exploratory System with Real-time Preference Elicitation ,
   Demo paper, 13th International Conference on Web Information System Engineering (WISE 2012), Nov. 2012, Paphos, Cyprus.
4. Y. Tzitzikas, A. Analyti and M. Kampouraki,
   Curating the Specificity of Metadata while World Models Evolve ,
   Proceedings of the 9th Annual International Conference on Digital Preservation (iPres2012), Oct. 2012, Toronto.
5. Y. Tzitzikas, Y. Marketakis and Y. Kargakis,
   Conversion and Emulation-aware Dependency Reasoning for Curation Services ,
   Proceedings of the 9th Annual International Conference on Digital Preservation (iPres2012), Oct. 2012, Toronto.
6. A. Shaon, D. Giaretta, S. Crompton, E. Conway, B. Matthews, F. Marelli, U. Giammatteo, Y. Marketakis, Y. Tzitzikas, R. Guarino, H. Brocks and F. Engel,
   Towards a Long-term Preservation Infrastructure for Earth Science Data ,
   Proceedings of the 9th Annual International Conference on Digital Preservation (iPres2012), Oct. 2012, Toronto.
7. P. Fafalios, I. Kitsos, Y. Marketakis, C. Baldassarre, M. Salampasis and Y. Tzitzikas,
   Web Searching with Entity Mining at Query Time ,
   Proceedings of the 5th Information Retrieval Facility Conference, IRF 2012, Vienna, July 2012.
8. C. Strubulis, Y. Tzitzikas, M. Doerr and G. Flouris,
   Evolution of Workflow Provenance Information in the Presence of Custom Inference Rules ,
   3rd International Workshop on the role of Semantic Web in Provenance Management (SWPM'12), co-located with ESWC'12, Heraklion, Crete, June 2012
9. P. Fafalios, I. Kitsos and Y. Tzitzikas,
   Scalable, Flexible and Generic Instant Overview Search ,
   Demo Paper, Proceedings of the 21st International Conference on World Wide Web, WWW 2012, Lyon, France, April 2012.
10. M. Doerr and Y. Tzitzikas,
    Information Carriers and Identification of Information Objects: An Ontological Approach ,
    CoRR, Digital Libraries, arXiv: 1201.0385v1 [cs.DL], January 2012
11. Panagiotis Papadakos, Stella Kopidaki, Nikos Armenatzoglou and Yannis Tzitzikas
    On exploiting Static and Dynamically mined Metadata for Exploratory Web Searching ,
    KAIS Journal 30(3): 493-525 (2012)
12. S. Zampetakis, Y. Tzitzikas, A. Leonidis and D. Kotzinos
    Star-like Auto-Configurable Layouts of Variable Radius for Visualizing and Exploring RDF/S Ontologies ,
    Journal of Visual Languages and Computing 23(3), 2012

2011

1. P. Fafalios and Y. Tzitzikas
   Exploiting Available Memory and Disk for Scalable Instant Overview Search ,
   12th International Conference on Web Information System Engineering, WISE 2011, Sydney, Australia, October 2011
2. N. Manolis and Y. Tzitzikas
   Interactive Exploration of Fuzzy RDF Knowledge Bases ,
   8th Extended Semantic Web Conference, ESWC 2011, Heraklion, Greece, June 2011
3. D. Zeginis, Y. Tzitzikas, V. Christophides,
   On Computing Deltas of RDF/S Knowledge Bases ,
   ACM Transactions on the Web (TWEB), 5(3): 14 (2011)
4. Y. Tzitzikas, Y. Marketakis, V. Christophides
   Preservation of Intelligibility of Digital Objects ,
   in D.G. Giarretta ed. Advanced Digital Preservation, Springer 2011
5. M. Hickson, Y. Kargakis and Y. Tzitzikas
   Similarity-based Browsing over Linked Open Data ,
   CoRR, Digital Libraries, arXiv: 1106.4176 [cs.DL], June 2011
6. Carlo Meghini, Yannis Tzitzikas, Veronica Coltella, Anastasia Analyti
   Query processing in distributed, taxonomy-based information sources ,
   CoRR abs/1109.2425 (2011)

2010

1. M. Theodoridou, Y. Tzitzikas, M. Doerr, Y. Marketakis, V. Melesssanakis,
   Modeling and Querying Provenance by Extending CIDOC CRM ,
   J. Distributed and Parallel Databases (J. DAPD) , 27(2), Special Issue Provenance in Scientific Databases, 2010
2. Dimitrios Kastrinakis and Yannis Tzitzikas
   Advancing Search Query Autocompletion Services with More and Better Suggestions ,
   Procs of the 10th International Conference on Web Engineering, ICWE'2010,
   Vienna, Austria, July 2010.
3. Yannis Tzitzikas, Yannis Marketakis and Grigoris Antoniou
   Task-based Dependency Management for the Preservation of Digital Objects using Rules ,
   Procs of 6th Hellenic Conference on Artificial Intelligence, SETN'2010,
   Athens, Greece, May 2010.
4. Stamatis Zampetakis, Yannis Tzitzikas, Asterios Leonidis, Dimitris Kotzinos
   StarLion: Auto-Configurable Layouts for Exploring Ontologies ,
   Procs of the 7th Extended Semantic Web Conference (Demo Track), ESWC'2010,
   Heraklion, Greece, June 2010.
5. Yannis Tzitzikas and Yannis Marketakis
   Automating the Ingestion and the Transformation of Embedded Metadata (in CASPAR) ,
   ERCIM News,
   January 2010
6. Yannis Tzitzikas and Vassilis Christophides
   Knowledge Management for Digital Preservation ,
   ERCIM News,
   January 2010

2009

1. Book: Giovanni Maria Saco and Yannis Tzitzikas (Eds)
   Dynamic Taxonomies and Faceted Search: Theory, Practice and Experience , Springer, 2009
   
2. Y. Marketakis and Y. Tzitzikas,
   Dependency Management for Digital Preservation using Semantic Web technologies ,
   International Journal on Digital Libraries (IJDL) , 10(4), 2009
3. Panagiotis Papadakos, Stella Kopidaki, Nikos Armenatzoglou and Yannis Tzitzikas
   Exploratory Web Searching with Dynamic Taxonomies and Results Clustering ,
   Procs of the 13th European Conference on Digital Libraries (ECDL'09), Corfu, Greece, Sep-Oct 2009
   (to be presented also at the 8th Hellenic Data Management Symposium - HDMS’09, August 2009, Athens Greece).
4. Stella Kopidaki, Panagiotis Papadakos and Yannis Tzitzikas
   STC+ and NM-STC: Two Novel Online Results Clustering Methods for Web Searching ,
   Procs of the 10th International Conference on Web Systems Engineering (WISE'09), Poznan, Poland, Oct 2009
5. Anastasia Analyti, Yannis Tzitzikas and Nicolas Spyratos
   Specifying Valid Compound Terms in Interrelated Faceted Taxonomies ,
   Procs of the 28th International Conference on Conceptual Modeling (ER'09), Gramado, Brazil, Nov 2009.
6. Yannis Marketakis, Makis Tzanakis and Yannis Tzitzikas
   PreScan: Towards Automating the Preservation of Digital Objects ,
   International ACM Conference on Management of Emergent Digital EcoSystems (MEDES'09), Lyon, France, Oct. 2009.
7. Panagiotis Papadakos, Yannis Theoharis, Nikos Armenatzoglou and Yannis Tzitzikas
   Object-Relational Database Representations for Text Indexing ,
   CoRR, Information Retrieval, arXiv:0906.3112v1 [cs.IR], June 2009
8. Yannis Tzitzikas
   On Providing Intelligibility-Aware Preservation Services for Digital Objects ,
   Data Science Journal 8: 139-151 (2009)
9. Dimitris Kotzinos, Giorgos Flouris, Yannis Tzitzikas, Dimitris Andreou, Vassilis Christophides
   Supporting Evolution of Knowledge Artifacts in Web Based Learning Environments ,
   in Solutions and Innovations in Web-Based Technologies for Augmented Learning: Improved Platforms, Tools and Applications, (Series Title: Advances in Web-Based Learning), IGI Global, 2009

2008

1. Yannis Theoharis, Yannis Tzitzikas, Dimitris Kotzinos and Vassilis Christophides
   On Graph Features of Semantic Web Schemas ,
   IEEE Transactions on Knowledge and Data Engineering, 2008
2. Yannis Tzitzikas, Yannis Theoharis and Dimitris Andreou
   On Storage Policies for Semantic Web Repositories that Support Versioning ,
   Procs of the 5th European Semantic Web Conference (ESWC'08), Tenerife, Spain, June 2008
3. Yannis Tzitzikas, Yannis Theoharis and Dimitris Andreou
   On Archiving and Versioning Semantic Web Data ,
   Procs of the 7th Hellenic Data Management Symposium (HDMS'2008), Heraklion, Greece, July 2008
4. Carlo Meghini, Nicolas Spyratos and Yannis Tzitzikas
   Abduction for Accessing Information Sources ,
   Journal Foundamenta Informaticae, (83), 2008
5. Dimitris Zeginis, Yannis Tzitzikas and Vassilis Christophides
   On Computing Deltas of RDF/S Knowledge Bases ,
   Procs of the 7th Hellenic Data Management Symposium (HDMS'2008), Heraklion, Greece, July 2008
6. P. Papadakos, Y. Theoharis, Y. Marketakis, N. Armenatzoglou and Y. Tzitzikas
   Mitos: Design and Evaluation of a DBMS-based Web Search Engine ,
   Procs of 12th Pan-Hellenic Conference of Informatics (PCI'2008), Samos, Greece, August 2008
7. Yannis Tzitzikas, N. Armenatzoglou and P. Papadakos
   FleXplorer: A Framework for Providing Faceted and Dynamic Taxonomy-based Information Exploration ,
   Procs of FIND'2008 (at DEXA '08), Turin, Italy, September 2008
8. Ioannis Roussidis, George Tzagkarakis, Dimitris Plexousakis and Yannis Tzitzikas
   On a Probabilistic Combination of Prediction Sources ,
   17th International Symposium on Methodologies for Intelligent Systems (ISMIS'08), Toronto, Canada, May 20-23, 2008
9. P. Papadakos, G. Vasiliadis, Y. Theoharis, N. Armenatzoglou, S. Kopidaki, Y. Marketakis, M. Daskalakis, K. Karamaroudis, G. Linardakis, G. Makrydakis, V. Papathanasiou, L. Sardis, P. Tsialiamanis, G. Troullinou, K. Vandikas, D. Velegrakis and Y. Tzitzikas
   The Anatomy of Mitos Web Search Engine ,
   CoRR, Information Retrieval, abs/0803.2220, 2008

2007

1. Yannis Tzitzikas,
   Evolution of Faceted Taxonomies and CTCA Expressions ,
   KAIS Journal, 13(3), 2007
2. Yannis Tzitzikas, Anastasia Analyti, Nicolas Spyratos and Panos Constantopoulos,
   An Algebra for Specifying Valid Compound Terms in Faceted Taxonomies ,
   Journal on Data and Knowledge Engineering (DKE), 62(1), 2007.
3. Yannis Tzitzikas, Dimitris Kotzinos and Yannis Theoharis,
   On Ranking RDF Schema Elements (and its Application in Visualization) ,
   Journal of Universal Computer Science (JUCS), Special Issue: Ontologies and Their Applications, Nov 2007
4. Yannis Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis and N. Spyratos
   Emergent Knowledge Artifacts for Supporting Trialogical E-Learning ,
   International Journal of Web-based Learning and Teaching Technologies, IJWLTT 2(3): 19-41 (2007).
5. Dimitris Zeginis, Yannis Tzitzikas and Vassilis Christophides,
   On the Foundations of Computing Deltas between RDF models ,
   Procs of the 6th International Semantic Web Conference (ISWC'2007), Korea, Nov. 2007. (BEST PAPER AWARD)
6. Yannis Tzitzikas and Giorgos Flouris
   Mind the (Intelligibility) Gap ,
   Procs of 11th European Conference on Research and Advanced Technology for Digital Libraries, ECDL'2007, Budapest, Hungary, September 2007.
7. Yannis Tzitzikas,
   Dependency Management for the Preservation of Digital Information ,
   Procs of the 18th International Conference on Database and Expert Systems Applications, DEXA'2007, Regensburg, Germany, September 2007.
8. Yannis Tzitzikas,
   On Preserving the Intelligibility of Digital Objects through Dependency Management ,
   Procs of the International Conference PV'2007 (Ensuring the Long-Term Preservation and Value Adding to Scientific and Technical Data), Oberpfaffenhofen/Munich, Germany, October 2007.
9. Yannis Tzitzikas and Yannis Theoharis,
   Naming Functions for the Vector Space Model ,
   Procs of the 29th European Conference on Information Retrieval, ECIR'2007, Rome, Italy, April 2007.
10. Yannis Tzitzikas and Dimitris Kotzinos,
    (Semantic Web) Evolution through Change Logs: Problems and Solutions ,
    Procs of Artificial Intelligence and Applications, AIA’2007, Innsbruck, Austria, February 2007.
11. Yannis Tzitzikas and Anastasia Analyti,
    Faceted Taxonomy-based Information Management ,
    Procs of the International Workshop on Dynamic Taxonomies and Faceted Search, FIND'2007 (satellite workshop of DEXA'2007), Regensburg, Germany, September 2007
12. Carlo Meghini, Yannis Tzitzikas and Anastasia Analyti,
    Query Evaluation in P2P Systems of Taxonomy-based Sources: Algorithms, Complexity, and Optimizations ,
    CoRR arXiv:0709.3034v1 [cs.DB], 2007

2006

1. Yannis Tzitzikas,
   An Algebraic Method for Compressing Symbolic Data Tables ,
   Journal on Intelligent Data Analysis, 10(4), 2006.
2. Yannis Tzitzikas, Carlo Meghini and Nicolas Spyratos,
   A Unified Interaction Scheme for Information Sources ,
   Journal of Intelligent Information Systems (JIIS), 26(1), January 2006.
3. Yannis Tzitzikas and Anastasia Analyti,
   Mining the Meaningful Term Conjunctions from Materialised Faceted Taxonomies: Algorithms and Complexity ,
   KAIS Journal, 9(4), 2006
4. Yannis Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis and N. Spyratos
   Emergent Knowledge Artifacts for Supporting Trialogical E-Learning ,
   Procs of the First International Workshop on Building Technology Enhanced Learning solutions for Communities of Practice, TEL-CoPS'2006,
   Heraklion, October 2006.
5. Yannis Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis and N. Spyratos
   Trialogical E-Learning and Emergent Knowledge Artifacts ,
   Procs of the First European Conference on Technology Enhanced Learning, EC-TEL'2006,
   Heraklion, October 2006.
6. Yannis Tzitzikas and Jean-Luc Hainaut,
   On the Visualization of Large-sized Ontologies ,
   Procs of the 8th International Conference on Advanced Visual Interfaces, AVI'2006,
   Venezia, May, 2006.
7. Yannis Tzitzikas
   Revising Faceted Taxonomies and CTCA Expressions ,
   Procs of 4th Hellenic Conference on Artificial Intelligence, SETN'2006,
   Heraklion, Greece, May 2006.
8. Carlo Meghini, Yannis Tzitzikas and Nicolas Spyratos
   Abduction for Extending Incomplete Information Sources ,
   Procs of 4th Hellenic Conference on Artificial Intelligence, SETN'2006,
   Heraklion, Greece, May 2006.
9. Y Theoharis, V. Christophides and Y. Tzitzikas
   On Graph Features of Semantic Web Schemas ,
   Procs of the 5th Hellenic Data Management Symposium, HDMS'2006,
   Thessaloniki, Greece, September 2006.

2005

1. Yannis Tzitzikas and Jean-Luc Hainaut,
   How to Tame a Very Large ER Diagram (using Link Analysis and Force-Directed Placement Algorithms) ,
   Procs of 24th International Conference on Conceptual Modeling, ER'05,
   Klagenfurt, Austria, October 2005.
2. Yannis Tzitzikas and Jean-Luc Hainaut,
   Less is More: How to Tame a Very Large ER Diagram ,
   Procs of 4th Hellenic Data Management Symbosium, HDMS'05,
   Athens, Greece, August 2005.
3. Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos,
   Mediators over Taxonomy-based Information Sources ,
   VLDB Journal, 14(1), March 2005
4. Yannis Tzitzikas, Anastasia Analyti and Nicolas Spyratos,
   Compound Term Composition Algebra: The Semantics ,
   LNCS Journal on Data Semantics, Volume 2, January 2005

2004

1. Yannis Tzitzikas, R. Launonen, M. Hakkarainen, P. Kohonen, T. Leppanen, E. Simpanen, H. Tornroos, P. Uusitalo and P. Vanska
   FASTAXON: A system for FAST (and Faceted) TAXONomy design ,
   Procs of the 23rd International. Conference. on Conceptual Modeling, ER’2004,
   Shanghai, China, November 2004
2. Carlo Meghini and Yannis Tzitzikas
   Querying Articulated Sources ,
   Procs of the 3rd International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems, ODBASE’2004,
   Larnaca, Cyprus, October 2004
3. Yannis Tzitzikas and Anastasia Analyti
   Mining the Meaningful Compound Terms from Materialised Faceted Taxonomies ,
   Procs of the 3rd International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems, ODBASE’2004,
   Larnaca, Cyprus, October 2004
4. Yannis Tzitzikas
   An Algebraic Method for Compressing Very Large Symbolic Data Tables ,
   Procs of the Workshop on Symbolic and Spatial Data Analysis of ECML/PKDD 2004, SSDA’2004 ,
   Pisa, Italy, September 2004.
5. Yannis Tzitzikas, Carlo Meghini, and Nicolas Spyratos,
   A Unifying Framework for Flexible Information Access in Taxonomy-based Sources ,
   Procs of the 6th International Conference on Flexible Query Answering Systems, FQAS’2004,
   Lyon France, June 2004.
6. Carlo Meghini, Nicolas Spyratos and Yannis Tzitzikas (Editors)
   Procs of the 1st International Workshop on Peer-to-Peer Computing and Databases , P2P&DB 2004,
   (at EDBT'2004) Heraklion, Crete - Greece, March 14, 2004. (online version)
7. Yannis Tzitzikas, Carlo Meghini, and Nicolas Spyratos,
   Towards a Generalized Interaction Scheme for Information Access ,
   Procs of the 3rd International Symposium on Foundations of Information and Knowledge Systems, FoIKS’2004,
   Vienna Austria, February 2004.

2003

1. Nicolas Spyratos and Yannis Tzitzikas
   Searching ,
   Wiley Encyclopedia of Electrical and Electronics Engineering
   John Wiley & Sons
2. Yannis Tzitzikas, Anastasia Analyti and Nicolas Spyratos,
   The Semantics of the Compound Term Composition Algebra ,
   Procs of the 2nd International Conference on Ontologies, Databases and Applications of Semantics, ODBASE’2003,
   Catania, Sicily, Italy, November 2003
3. Yannis Tzitzikas and Carlo Meghini
   Query Evaluation in Peer-to-Peer Networks of Taxonomy-based Sources ,
   Procs of the 10th International Conference on Cooperative Information Systems, CoopIS’2003,
   Catania, Sicily, Italy, November 2003
4. Yannis Tzitzikas, Carlo Meghini, and Nicolas Spyratos
   Taxonomy-based Conceptual Modeling for Peer-to-Peer Networks ,
   Procs of the 22th International Conference on Conceptual Modeling, ER’2003,
   Chicago, Illinois, October 2003
5. Carlo Meghini and Yannis Tzitzikas
   Query Evaluation over Networks of Logic-based Mediators (POSITION PAPER),
   Procs of the 7th International Workshop on Description Logics, DL’2003,
   Rome, Italy, September 2003
6. Yannis Tzitzikas, Anastasia Analyti, Nicolas Spyratos and Panos Constantopoulos
   An Algebraic Approach for Specifying Compound Terms in Faceted Taxonomies ,
   Procs of the 2nd Hellenic Data Management Symposium, HDMS’2003,
   Athens, Greece September, 2003
7. Yannis Tzitzikas and Carlo Meghini
   Ostensive Automatic Schema Mapping for Taxonomy-based Peer-to-Peer Systems ,
   Procs of the 7th International Workshop on Cooperative Information Agents, CIA’2003,
   Helsinki, Finland, August 2003 (BEST PAPER AWARD)
8. Carlo Meghini, Yannis Tzitzikas and Nicolas Spyratos
   An Abduction-based Method for Index Relaxation in Taxonomy-based Sources ,
   Procs of the 28th International Symposium on Mathematical Foundations of Computer Science, MFCS’2003,
   Bratislava, Slovac Republic, August 2003
9. Yannis Tzitzikas, Anastasia Analyti, Nicolas Spyratos and Panos Constantopoulos
   An Algebra for Specifying Compound Terms for Faceted Taxonomies ,
   Procs of the 13th European-Japanese Conference on Information Modelling and Knowledge Bases, EJC’2003,
   (also published in Information Modelling and Knowledge Bases XV, IOS PRESS 2004)
   Kitakyushu, Japan, June 2003
10. Yannis Tzitzikas and Carlo Meghini
    Content-based Retrieval Services in Peer-to-Peer Systems using Taxonomies ,
    ERCIM News,
    Volume 53, April 2003

2002

1. Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos and Anastasia Analyti
   Extended Faceted Taxonomies for Web Catalogs ,
   Procs of the 3rd International Conference on Web Information Systems Engineering, WISE’2002,
   Singapore, December, 2002
2. Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos and Anastasia Analyti
   Extended Faceted Taxonomies for Web Catalogs ,
   ERCIM News,
   Volume 51, October 2002 (special issue: Semantic Web)
3. Yannis Tzitzikas and Nicolas Spyratos
   Result Fusion by Mediators Using Voting and Utility Functions ,
   CNRS-Universite de Paris Sud, Laboratoire de Recherche en Informatique
   Rapport de Recherche No 1332, Sep 2002
4. Yannis Tzitzikas
   Collaborative Ontology-based Information Indexing and Retrieval ,
   PhD Thesis, Department of Computer Science, University of Crete,
   September 2002
5. Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos
   Query Evaluation for Mediators over Web Catalogs ,
   International Journal of Information Theories and Applications, IJITA, 9(2), 2002.
6. Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos
   Query Evaluation for Mediators over Web Catalogs ,
   Procs of the 27th International Conference on Information and Communication Technologies and Programming, ICT&P'2002,
   Primorsko, Bulgaria, June 24-29, 2002
7. Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos and Anastasia Analyti
   Extended Faceted Ontologies ,
   Procs of 14th International Conference on Advanced Information Systems Engineering, CAiSE'2002(short paper),
   Toronto, Canada, May 11-12, 2002.
8. Nicolas Spyratos, Yannis Tzitzikas and V. Christofides
   On Personalizing the Catalogs of Web Portals ,
   Procs of 15th International FLAIRS Conference, FLAIRS'2002,
   Pensacola, Florida, May 2002
9. Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos
   Query Translation for Mediators over Ontology-based Information Sources ,
   Procs of 2nd Hellenic Conference on Artificial Intelligence, SETN'2002, Thessaloniki, Greece, April 11-12, 2002.

2001

1. Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos
   Mediators over Ontology-based Information Sources ,
   Procs of 2nd International Conference on Web Information Systems Engineering, WISE'2001, Kyoto, Japan, Dec 2001
2. Yannis Tzitzikas
   Democratic Data Fusion for Information Retrieval Mediators ,
   Procs of ACS/IEEE International Conference on Computer Systems and Applications, AICCSA'2001, Beirut, Lebanon, June 26-29, 2001
3. Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos
   Deriving Valid Expressions from Ontology Definitions ,
   Procs of the 11th European-Japanese Conference on Information Modelling and Knowledge Bases, EJC’2001 (also published in Information Modelling and Knowledge Bases XIII, IOS PRESS Amsterdam 2002), Maribor, Slovenia, 29 May-1 June, 2001
4. Yannis Tzitzikas and Panos Constantopoulos
   A Decision-theoretic Model for Information Retrieval Supporting Time Constraints ,
   Procs of the BCS-IRSG European Colloquium on IR Research, ECIR’2001, Darmstadt, Germany, April 4-6, 2001

Before 2001

1. Panos Constantopoulos and Yannis Tzitzikas
   Context-Driven Information Base Update ,
   Procs of the 8th International Conference on Advanced Information Systems Engineering, CAiSE'1996, Heraklion, Crete, Greece, May 20-24, 1996
2. Yannis Tzitzikas
   Exploiting Semantic Networks to Generate Hypermedia ,
   Procs of the 3rd Doctoral Consortium on Advanced Information Systems Engineering, CAiSE'1996, Heraklion, Crete, Greece, May 20-21 1996
3. Panos Constantopoulos, Yannis Tzitzikas and M. Theodorakis
   Developing Hypermedia Over an Information Repository ,
   Procs of the 2nd WorkShop on Open Hypermedia Systems at Hypertext96, OHS'1996, Washington DC, USA, March 16-20 1996
4. Yannis Tzitzikas
   View Updates in Knowledge Bases , Master's Thesis, CS Dep., University of Crete
   Technical Report FORTH-ICS-TR-142, October 1995 (in greek)

Publications of Yannis Tzitzikas in External Systems