- Grigoris Antoniou, George Potamias, Costas Spyropoulos, Dimitris Plexousakis, editors, Advances in Artificial Intelligence, 4th Helenic Conference on AI, SETN 2006, Heraklion, Crete, Greece, May 18-20, 2006, Proceedings. Volume 3955 of Lecture Notes in Computer Science, Springer, 2006.