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2007
Katifori A, Vassilakis C, Torou E, Lepouras G, Halatsis C., Daradimos I..  2007.  Historical Archive Ontologies Requirements, Modeling and Visualization. RCIS. :401-406.
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.
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.
Vassilakis C, Lepouras G, Katifori A.  2007.  Web service execution streamlining. Proceedings - ICSSSM'06: 2006 International Conference on Service Systems and Service Management. 2:1564-1569.
2006
Katifori A, Torou E, Halatsis C., Lepouras G, Vassilakis C.  2006.  A Comparative Study of Four Ontology Visualization Techniques in Protege: Experiment Setup and Preliminary Results. IV '06: Proceedings of the conference on Information Visualization. :417–423.
Vassilakis C, Lepouras G.  2006.  Component reuse in electronic services development. J. Comp. Methods in Sci. and Eng.. 6:229–241.
Golemati M., Halatsis C., Vassilakis C, Katifori A, Lepouras G.  2006.  A context-based adaptive visualization environment. Proceedings of the International Conference on Information Visualisation. :62-67.
Torou E, Katifori A, Vassilakis C, Lepouras G, Halatsis C..  2006.  Creating an Historical Archive Ontology: Guidelines and Evaluation. ICDIM. :102-109.
Lepouras G, Vassilakis C.  2006.  Encyclopedia of E-Commerce, E-Government and Mobile Commerce. :1–6.
Lepouras G, Sotiropoulou A, Theotokis D, Vassilakis C.  2006.  Encyclopedia of E-Commerce, E-Government and Mobile Commerce. :1064–1069.
Vassilakis C, Lepouras G.  2006.  Encyclopedia of E-Commerce, E-Government and Mobile Commerce. :865–870.
Vassilakis C, Lepouras G, Katifori A.  2006.  Reverse engineering electronic services: from e-forms to knowledge. ICSOFT (1). :273-278.
Magoulas G.D, Lepouras G, Vassilakis C.  2006.  Virtual reality in the e-Society. Virtual Reality. 11:71-73.
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.
2005
Lepouras G, Vassilakis C, Sotiropoulou A, Theotokis D, Katifori A.  2005.  An active ontology-based blackboard architecture for Web service interoperability. 2005 International Conference on Services Systems and Services Management, Proceedings of ICSSSM'05. 1:573-578.
Lepouras G, Vassilakis C.  2005.  Adaptable and Adaptive Hypermedia Systems. :190–205.
Vassilakis C, Lepouras G, Fraser J, Haston S.  2005.  Barriers To Electronic Service Development. e-Service Journal. Fall 2005:41-63.
Vassilakis C, Lepouras G, Rouvas S., Georgiadis P..  2005.  Exploiting form semantics and validation checks to improve e-form layout. International Journal of Web Engineering and Technology. 2:81-96.
Vassilakis C, Lepouras G, Halatsis C., Lobo TPariente.  2005.  An XML model for electronic services. Electronic Government. 2:41-55.
2004
Weir G.R.S., Lepouras G, Vassilakis C.  2004.  Content enrichment through dynamic annotation. ICEIS 2004 - Proceedings of the Sixth International Conference on Enterprise Information Systems. :152-157.
Vassilakis C, Lepouras G, Rouvas S., Georgiadis P..  2004.  Integrating e-government public transactional services into public authority workflows. Electronic Government. 1:49-60.
Lepouras G, Katifori A, Vassilakis C, Charitos D..  2004.  Real exhibitions in a virtual museum. Virtual Reality. 7:120–128.
Vassilakis C, Lepouras G.  2004.  Reusability in Electronic Services Development. Proceedings of the CSITeA 04 conference.
Lepouras G, Sotiropoulou A, Theotokis D, Vassilakis C.  2004.  Tailorability in the context of E-government Information Systems: An approach. Proceedings of the IRMA 2004 conference.
Lepouras G, Vassilakis C.  2004.  Virtual museums for all: Employing game technology for edutainment. Virtual Reality. 8:96–106.