Intelligent Information Processing Using TRLi. - Themis Panayiotopoulos; Manolis Gergatsoulis (DEXA Workshop, 1995)

On the Issue of Valid Time(s) in Temporal Databases. - Stavros Kokkotos; Efstathios V. Ioannidis; Themis Panayiotopoulos; Constantine D. Spyropoulos (SIGMOD Rec., 1995)

Cactus: A Branching-Time Logic Programming Language. - Panos Rondogiannis; Manolis Gergatsoulis; Themis Panayiotopoulos (ECSQARU-FAPR, 1997)

Branching-Time Logic Programming: The Language Cactus and its Applications. - Panos Rondogiannis; Manolis Gergatsoulis; Themis Panayiotopoulos (Comput. Lang., 1998)

Modeling History with Artificial Intelligence Techniques. - Vasilis S. Belessiotis; Nikos Alexandris; Themis Panayiotopoulos (Applied Informatics, 1999)

Visualising logic programs in virtual worlds. - Themis Panayiotopoulos; Spyros Vosinakis; Sophia Kousidou; L. Balafa (VRST, 1999)

Temporal Disjunctive Logic Programming. - Manolis Gergatsoulis; Panos Rondogiannis; Themis Panayiotopoulos (New Gener. Comput., 2000)

Machine Learning and Intelligent Agents. - Themis Panayiotopoulos; Nick Z. Zacharis (Machine Learning and Its Applications, 2001)

Virtual Agent Societies with the mVITAL Intelligent Agent System. - George Anastassakis; Themis Panayiotopoulos; Tim Ritchings (IVA, 2001)

SimHuman: A Platform for Real-Time Virtual Agents with Planning Capabilities. - Spyros Vosinakis; Themis Panayiotopoulos (IVA, 2001)

Multi-agent Systems as Intelligent Virtual Environments. - George Anastassakis; Tim Ritchings; Themis Panayiotopoulos (KI/ÖGAI, 2001)

A metagenetic algorithm for information filtering and collection from the World Wide Web. - Nick Z. Zacharis; Themis Panayiotopoulos (Expert Syst. J. Knowl. Eng., 2001)

Web Search Using a Genetic Algorithm. - Nick Z. Zacharis; Themis Panayiotopoulos (IEEE Internet Comput., 2001)

Genetic Evolution of Software Microorganisms. - Themis Panayiotopoulos; Harry Kalogirou; Anthony Petropoulos; Dionisis Dimopoulos (SETN, 2002)

Programmable Agent Perception in Intelligent Virtual Environments. - Spyros Vosinakis; Themis Panayiotopoulos (IVA, 2003)

Web and Mobile secure access to a Web Based Medical System. - Vasileios Skilogiannis; Themis Panayiotopoulos; Stavros Papadakis; Virginia Grammenou; Ioannis Mantas (MIE, 2003)

Using Motivation-Driven Continuous Planning to Control the Behaviour of Virtual Agents. - Nikos Avradinis; Ruth Aylett; Themis Panayiotopoulos (International Conference on Virtual Storytelling, 2003)

A Task Definition Language for Virtual Agents. - Spyros Vosinakis; Themis Panayiotopoulos (WSCG, 2003)

Synthetic Characters with Emotional States. - Nikos Avradinis; Themis Panayiotopoulos; Spyros Vosinakis (SETN, 2004)

Intelligent Web Prefetching Based upon User Profiles - The WebNaut Case. - George Kastaniotis; Nick Z. Zacharis; Themis Panayiotopoulos; Christos Douligeris (SETN, 2004)

A System for Logic-Based Intelligent Virtual Agents. - George Anastassakis; Themis Panayiotopoulos (Int. J. Artif. Intell. Tools, 2004)

Distributed Virtual Reality Authoring Interfaces for the WWW: The VR-Shop Case. - Iraklis Varlamis; Michalis Vazirgiannis; Iosif Lazaridis; M. Papageorgiou; Themis Panayiotopoulos (Multim. Tools Appl., 2004)

A Tool for Constructing 3D Environments with Virtual Agents. - Spyros Vosinakis; Themis Panayiotopoulos (Multim. Tools Appl., 2005)

Hermes - A Framework for Location-Based Data Management. - Nikos Pelekis; Yannis Theodoridis; Spyros Vosinakis; Themis Panayiotopoulos (EDBT, 2006)

A Framework for Uniform Development of Intelligent Virtual Agents. - George Anastassakis; Themis Panayiotopoulos (SETN, 2006)

Handling spatial vagueness in virtual agent control. - Spyros Vosinakis; Nikos Pelekis; Yannis Theodoridis; Themis Panayiotopoulos (GRAPP (AS/IE), 2007)

Modeling Spatiotemporal Uncertainty in Dynamic Virtual Environments. - Spyros Vosinakis; George Anastassakis; Themis Panayiotopoulos (IVA, 2007)

Personalization of Content in Virtual Exhibitions. - Bill Bonis; John Stamos; Spyros Vosinakis; Ioannis Andreou; Themis Panayiotopoulos (SAMT, 2007)

A platform for virtual museums with personalized content. - Bill Bonis; John Stamos; Spyros Vosinakis; Ioannis Andreou; Themis Panayiotopoulos (Multim. Tools Appl., 2009)

Intelligent Virtual Environment Development with the REVE Platform: An Overview. - George Anastassakis; Themis Panayiotopoulos (IVA, 2011)

An Architectural Pattern for X3D-based Virtual Environments - An Object-oriented Approach. - George Anastassakis; Themis Panayiotopoulos (GRAPP/IVAPP, 2012)

A Transparent and Decentralized Model of Action for Intelligent Virtual Agents. - George Anastassakis; Themis Panayiotopoulos (ICTAI, 2012)

Motivated Agents in Virtual Worlds. - Nikos Avradinis; George Anastassakis; Themis Panayiotopoulos (JCKBSE, 2012)

Towards a Methodology for Integrating Physics Engines with Virtual Environments: A Case Study Using the REVE Platform and the Vesper3D Physics Engine. - George Anastassakis; Themis Panayiotopoulos; Gerasimos Raptis (Panhellenic Conference on Informatics, 2012)

A unified model for representing objects with physical properties, semantics and functionality in virtual environments. - George Anastassakis; Themis Panayiotopoulos (Intell. Decis. Technol., 2012)

Problem-based Virtual World Design for Virtual Reality Education - An Experiment with the Opensimulator Platform for Second Life-based Virtual Worlds. - George Anastassakis; Themis Panayiotopoulos (CSEDU, 2013)

Modelling basic needs as agent motivations. - Nikos Avradinis; Themis Panayiotopoulos; George Anastassakis (Int. J. Comput. Intell. Stud., 2013)

Semantic concepts in BPMN 2.0. - Eleni-Maria Kalogeraki; Stamatios Theocharis; Dimitris Apostolou; George A. Tsihrintzis; Themis Panayiotopoulos (IISA, 2014)

A Transparent and Decentralized Model of Perception and Action for Intelligent Virtual Agents. - George Anastassakis; Themis Panayiotopoulos (Int. J. Artif. Intell. Tools, 2014)

Editorial. - George A. Tsihrintzis; Themis Panayiotopoulos; Ioannis P. Vlahavas; Sotiris G. Ziavras (Int. J. Artif. Intell. Tools, 2014)

A tool for programming the behaviour of intelligent virtual agents in Prolog. - George Anastassakis; Themis Panayiotopoulos (IISA, 2015)

Semantic queries in BPMN 2.0: A contemporary method for information retrieval. - Eleni-Maria Kalogeraki; Themis Panayiotopoulos; Dimitris Apostolou (IISA, 2015)

Ontology-based model for learning object metadata. - Eleni-Maria Kalogeraki; Christos Troussas; Dimitris Apostolou; Maria Virvou; Themis Panayiotopoulos (IISA, 2016)

Exploring Cyber-Security Issues in Vessel Traffic Services. - Eleni-Maria Kalogeraki; Spyridon Papastergiou; Nineta Polemi; Christos Douligeris; Themis Panayiotopoulos (KSEM (1), 2018)