@inproceedings{NACLP-1989-MarekT,
	author        = "V. Wiktor Marek and Miroslaw Truszczynski",
	booktitle     = "{Proceedings of the North American Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-62064-2",
	pages         = "243--256",
	publisher     = "{MIT Press}",
	title         = "{Stable Semantics for Logic Programs and Default Theories}",
	year          = 1989,
}