@inproceedings{JICSLP-1992-ColussiM,
	author        = "Livio Colussi and Elena Marchiori",
	booktitle     = "{Proceedings of the Joint International Ninth Conference and Symposium on Logic Programming}",
	isbn          = "0-262-51064-2",
	pages         = "67--81",
	publisher     = "{MIT Press}",
	title         = "{A Predicate Transformer for Unification}",
	year          = 1992,
}