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Petrakis E.G.M., Varelas G, Hliaoutakis A, Raftopoulou P.  2006.  X-Similarity: Computing Semantic Similarity between Concepts from Different Ontologies. Journal of Digital Information Management (JDIM).
Vassilakis C, Lepouras G, Halatsis C., Lobo TPariente.  2005.  An XML model for electronic services. Electronic Government. 2:41-55.
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Golemati M., Vassilakis C, Katifori A, Lepouras G, Halatsis C..  2009.  Visualizing Hierarchies: Evaluating the Efficiency and Cognitive Effects of Six Visualization Techniques for Browsing and Management Tasks. Information Visualization 2009, book of abstracts.
Katifori A, Vassilakis C, Lepouras G, Daradimos I., Halatsis C..  2006.  Visualizing a temporally-enhanced ontology. AVI '06: Proceedings of the working conference on Advanced visual interfaces. :488–491.
Katifori A, Vassilakis C, Lepouras G, Halatsis C..  2014.  Visualization method effectiveness in ontology-based information retrieval tasks involving entity evolution. Proceedings of SMAP 2014.
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Spiliopoulou M., Hatzopoulos M., Vassilakis C.  1992.  Using Parallelism and Pipeline for the Optimisation of Join Queries. PARLE '92: Proceedings of the 4th International PARLE Conference on Parallel Architectures and Languages Europe. :279–294.
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Katifori A, Torou E, Vassilakis C, Halatsis C..  2008.  Supporting research in historical archives: Historical information visualization and modeling requirements. Proceedings of the International Conference on Information Visualisation. :32-37.
Tambouris E., Boukis G., Vassilakis C, Lepouras G, Rouvas S., Canadas R., Heredia S., Usero J.CLopez.  2002.  SMARTGOV: A Governmental Knowledge-based Platform for Public Sector Online Services. Proceedings KMGov2002. :173–185.
Vassilakis C, Kotis K, Spiliotopoulos D, Margaris D, Kasapakis V, Anagnostopoulos C-N, Santipantakis G, Vouros GA, Kotsilieris T, Petukhova V et al..  2020.  A Semantic Mixed Reality Framework for Shared Cultural Experiences Ecosystems. Big Data and Cognitive Computing. 4:6.
Katifori A, Torou E, Vassilakis C, Lepouras G, Halatsis C..  2008.  Selected results of a comparative study of four ontology visualization methods for information retrieval tasks. Proceedings of the 2nd International Conference on Research Challenges in Information Science, RCIS 2008. :133-140.
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[Anonymous].  1999.  Proceedings of the Sixteenth National Conference on Artificial Intelligence and Eleventh Conference on Innovative Applications of Artificial Intelligence, July 18-22, 1999, Orlando, Florida, USA.
[Anonymous].  2018.  Proceedings of the 26th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, SIGSPATIAL 2018, Seattle, WA, USA, November 06-09, 2018.
[Anonymous].  2017.  Proceedings of the 25th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, GIS 2017, Redondo Beach, CA, USA, November 7-10, 2017.
Spiliopoulou M., Hatzopoulos M., Vassilakis C.  1993.  Parallel Optimisation of Join Queries Using a Technique of Exhaustive Nature. Computers and Artificial Intelligence. 12:145–166.
Zimmer C, Heinz J, Tryfonopoulos C, Weikum G.  2008.  P2P Information Retrieval and Filtering with MAPS. Proccedings of the IEEE International Conference on Peer-to-Peer Computing (P2P).
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Katifori A, Halatsis C., Lepouras G, Vassilakis C, Giannopoulou E.G..  2007.  Ontology visualization methods - A survey. ACM Computing Surveys. 39:10:1-10:43.
Hatzopoulos M., Gouscos D., Spiliopoulou M., Vassilakis C, Vazirgiannis M..  1990.  An Object-Oriented Data Model for Hypermedia Systems. Proceedings of the DELTA Conference in Research and Development. :483–493.
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Margaris D, Vassilakis C, Georgiadis P..  2017.  Knowledge-Based Leisure Time Recommendations in Social Networks. Current Trends on Knowledge-Based Systems. :23–48.
Vassilakis C, Lepouras G, Halatsis C..  2007.  A knowledge-based approach for developing multi-channel e-government services. Electronic Commerce Research and Applications. 6:113-124.
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Golemati M., Katifori A, Giannopoulou E.G., Daradimos I., Vassilakis C, Lepouras G, Halatsis C..  2008.  An interview-based user study on the use of visualizations for folder browsing. Proceedings of the International Conference on Information Visualisation. :106-112.
Golemati M., Vassilakis C, Katifori A, Lepouras G, Halatsis C..  2008.  Intelligent User Interfaces: Adaptation and Personalization Systems and Technologies. :188–204.
H
Torou E, Katifori A, Vassilakis C, Lepouras G, Halatsis C..  2010.  Historical research in archives: user methodology and supporting tools. International Journal on Digital Libraries. 11(1):25–36.
Katifori A, Vassilakis C, Torou E, Lepouras G, Halatsis C., Daradimos I..  2007.  Historical Archive Ontologies Requirements, Modeling and Visualization. RCIS. :401-406.
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Dix A, Lepouras G, Katifori A, Vassilakis C, Catarci T, Poggi A, Ioannidis Y, Morae M, Daradimos I., Md.Akima N et al..  2010.  From the web of data to a world of action. Journal of Web Semantics. 8 issue 4:394-408.
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Zervakis L, Setty V, Tryfonopoulos C, Hose K.  2019.  Efficient Continuous Multi-Query Processing over Graph Streams. CoRR. abs/1902.05134