@inproceedings{PODS-1986-GelfondPP,
	author        = "Michael Gelfond and Halina Przymusinska and Teodor C. Przymusinski",
	booktitle     = "{Proceedings of the Fifth Symposium on Principles of Database Systems}",
	doi           = "10.1145/6012.15410",
	isbn          = "0-89791-179-2",
	pages         = "133--139",
	publisher     = "{ACM}",
	title         = "{The Extended Closed World Assumpution and its Relationship to Parallel Circumscription}",
	year          = 1986,
}