@inproceedings{NACLP-1989-DungK89a,
	author        = "Phan Minh Dung and Kanchana Kanchanasut",
	booktitle     = "{Proceedings of the North American Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-62064-2",
	pages         = "604--625",
	publisher     = "{MIT Press}",
	title         = "{A Fixpoint Approach to Declarative Semantics of Logic Programs}",
	year          = 1989,
}