@inproceedings{JICSCP-1988-AptB88,
	author        = "Krzysztof R. Apt and Howard A. Blair",
	booktitle     = "{Proceedings of the Joint International Fifth Conference and Symposium on Logic Programming, 2 Volumes}",
	isbn          = "0-262-61056-6",
	pages         = "765--779",
	publisher     = "{MIT Press}",
	title         = "{Arithmetic Classification of Perfect Models of Stratified Programs}",
	year          = 1988,
}