Non-monotonic extensions of logic programming: Second International Workshop, NMELP ʹ96, Bad Honnef, Germany, September 5-6, 1996 : selected papers - Dix, Jurgen; Peereira, Luis Moniz; Przymusinski, Teodor C.; Dix, Jurgen (Lecture notes in computer science : Lecture notes in artificial intelligence, 1997)