@inproceedings{ICLP-1991-YardeniFS,
	author        = "Eyal Yardeni and Thom W. Frühwirth and Ehud Y. Shapiro",
	booktitle     = "{Proceedings of the Eighth International Conference on Logic Programming}",
	isbn          = "0-262-56058-5",
	pages         = "379--393",
	publisher     = "{MIT Press}",
	title         = "{Polymorphically Typed Logic Programs}",
	year          = 1991,
}