Advances in Informatics : 8th Panhellenic Conference on Informatics, PCI 2001 : Nicosia, Cyprus, November 8-10, 2001 : revised selected papers - Manolopoulos, Yannis, 1957-; Evripidou, Skevos, 1959-; Kakas, Antonis C. (Springer, 2003)