@inproceedings{JICSLP-1992-GelfondL,
	author        = "Michael Gelfond and Vladimir Lifschitz",
	booktitle     = "{Proceedings of the Joint International Ninth Conference and Symposium on Logic Programming}",
	isbn          = "0-262-51064-2",
	pages         = "559--573",
	publisher     = "{MIT Press}",
	title         = "{Representing Actions in Extended Logic Programming}",
	year          = 1992,
}