Methods and applications of artificial intelligence : Second Hellenic Conference on AI, SETN 2002, Thessaloniki, Greece, April 11-12, 2002 : proceedings - Βλαχάβας, Ιωάννης; Σπυρόπουλος, Κωνσταντίνος Δ. (Lecture notes in computer science ; Lecture notes in artificial intelligence, 2002)