Computational Logic: Logic Programming and Beyond Essays in Honour of Robert A. Kowalski, Part II Kakas Antonis C. Heftet / 2002 / Engelsk
Advances in Informatics 8th Panhellenic Conference on Informatics, PCI 2001. Nicosia, Cyprus, November 8-10, 2001, Revised Selected Papers Manolopoulos Yannis Heftet / 2003 / Engelsk
