@inproceedings{ICLP-1999-LauO,
	author        = "Kung-Kiu Lau and Mario Ornaghi",
	booktitle     = "{Proceedings of the 15th International Conference on Logic Programming}",
	isbn          = "0-262-54104-1",
	pages         = "611",
	publisher     = "{MIT Press}",
	title         = "{Isoinitial Models for Logic Programs: Some Preliminary Results}",
	year          = 1999,
}