@inproceedings{JICSCP-1988-PrzymusinskaP88,
	author        = "Halina Przymusinska and Teodor C. Przymusinski",
	booktitle     = "{Proceedings of the Joint International Fifth Conference and Symposium on Logic Programming, 2 Volumes}",
	isbn          = "0-262-61056-6",
	pages         = "1106--1120",
	publisher     = "{MIT Press}",
	title         = "{Weakly Perfect Model Semantics for Logic Programs}",
	year          = 1988,
}