@inproceedings{CLP-1990-Gaifman90,
	author        = "Haim Gaifman",
	booktitle     = "{Proceedings of the Seventh International Conference on Logic Programming}",
	isbn          = "0-262-73090-1",
	pages         = "779--782",
	publisher     = "{MIT Press}",
	title         = "{Semantics of Logic Programs}",
	year          = 1990,
}