@inproceedings{ILPS-1994-AlferesDP,
	author        = "José Júlio Alferes and Carlos Viegas Damásio and Luís Moniz Pereira",
	booktitle     = "{Proceedings of the International Symposium on Logic Programming}",
	isbn          = "0-262-52191-1",
	pages         = "424--438",
	publisher     = "{MIT Press}",
	title         = "{SLX — A Top-down Derivation Procedure for Programs with Explicit Negation}",
	year          = 1994,
}