@inproceedings{ICLP-1987-LassezMP87,
	author        = "Catherine Lassez and Ken McAloon and Graeme S. Port",
	booktitle     = "{Proceedings of the Fourth International Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-12125-5",
	pages         = "136--151",
	publisher     = "{MIT Press}",
	title         = "{Stratification and Knowledge Based Management}",
	year          = 1987,
}