@inproceedings{JICSLP-1996-NiemelaS,
	author        = "Ilkka Niemelä and Patrik Simons",
	booktitle     = "{Proceedings of the Joint International 13th Conference and Symposium on Logic Programming}",
	isbn          = "0-262-63173-3",
	pages         = "289--303",
	publisher     = "{MIT Press}",
	title         = "{Efficient Implementation of the Well-founded and Stable Model Semantics}",
	year          = 1996,
}