@inproceedings{ALP-1992-AptMP,
	author        = "Krzysztof R. Apt and Elena Marchiori and Catuscia Palamidessi",
	booktitle     = "{Proceedings of the Third International Conference on Algebraic and Logic Programming}",
	doi           = "10.1007/BFb0013820",
	isbn          = "3-540-55873-X",
	pages         = "69--83",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Theory of First-Order Built-in’s of Prolog}",
	volume        = 632,
	year          = 1992,
}