James P. Delgrande M. Gharib Robert E. Mercer Vincent Risch Torsten Schaub Lukaszewicz-style Answer Set Programming: A Preliminary Report. 2003 conf/asp/2003 Answer Set Programming http://SunSITE.Informatik.RWTH-Aachen.de/Publications/CEUR-WS//Vol-78/asp03-final-delgrande.pdf db/conf/asp/asp2003.html#DelgrandeGMRS03