@inproceedings{ILPS-1993-Andrews,
	author        = "James H. Andrews",
	booktitle     = "{Proceedings of the International Symposium on Logic Programming}",
	isbn          = "0-262-63152-0",
	pages         = "220--234",
	publisher     = "{MIT Press}",
	title         = "{A Logical Semantics for Depth-First Prolog with Ground Negation}",
	year          = 1993,
}