@inproceedings{ILPS-1993-Nilsson,
	author        = "Ulf Nilsson",
	booktitle     = "{Proceedings of the International Symposium on Logic Programming}",
	isbn          = "0-262-63152-0",
	pages         = "647",
	publisher     = "{MIT Press}",
	title         = "{Goal-directed Bottom-up Evaluation of Normal Logic Programs}",
	year          = 1993,
}