Deborah East Miroslaw Truszczynski aspps - An Implementation of Answer-Set Programming with Propositional Schemata. 402-405 2001 conf/lpnmr/2001 LPNMR http://link.springer.de/link/service/series/0558/bibs/2173/21730402.htm db/conf/lpnmr/lpnmr2001.html#EastT01