Grigoris Antoniou George Potamias Costas Spyropoulos Dimitris Plexousakis Advances in Artificial Intelligence, 4th Helenic Conference on AI, SETN 2006, Heraklion, Crete, Greece, May 18-20, 2006, Proceedings 3955 2006 3-540-34117-X SETN Lecture Notes in Computer Science Springer db/conf/setn/setn2006.html