@inproceedings{ISLP-1991-KempS,
	author        = "David B. Kemp and Peter J. Stuckey",
	booktitle     = "{Proceedings of the Eighth International Symposium on Logic Programming}",
	isbn          = "0-262-69147-7",
	pages         = "387--401",
	publisher     = "{MIT Press}",
	title         = "{Semantics of Logic Programs with Aggregates}",
	year          = 1991,
}