@inproceedings{ICLP-1991-HentenryckD,
	author        = "Pascal Van Hentenryck and Yves Deville",
	booktitle     = "{Proceedings of the Eighth International Conference on Logic Programming}",
	isbn          = "0-262-56058-5",
	pages         = "745--759",
	publisher     = "{MIT Press}",
	title         = "{The Cardinality Operator: A New Logical Connective for Constraint Logic Programming}",
	year          = 1991,
}