Artificial Intelligence: Theories, Models and Applications 6th Hellenic Conference on AI, SETN 2010, Athens, Greece, May 4-7, 2010. Proceedings - Konstantopoulos, Stasinos; Perantonis, Stavros; Karkaletsis, Vangelis; Spyropoulos, Constantine D.; Vouros, George (Springer Berlin Heidelberg, 2010)