@inproceedings{ICLP-1986-PooleG86,
	author        = "David Poole and Randy Goebel",
	booktitle     = "{Proceedings of the Third International Conference on Logic Programming}",
	doi           = "10.1007/3-540-16492-8_112",
	isbn          = "3-540-16492-8",
	pages         = "635--641",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Gracefully adding negation and disjunction to Prolog}",
	volume        = 225,
	year          = 1986,
}