Advances in human-computer interaction I : proceedings of the Panhellenic Conference with International Participation in Human-Computer Interaction (PC-HCI 2001), December 7-9, 2001, Patras-Greece - Φακωτάκης, Νικόλαος; Αβούρης, Νικόλαος Μ. 1956- (Typorama, 2001)