@inproceedings{PODS-1986-Vardi,
	author        = "Moshe Y. Vardi",
	booktitle     = "{Proceedings of the Fifth Symposium on Principles of Database Systems}",
	doi           = "10.1145/6012.15419",
	isbn          = "0-89791-179-2",
	pages         = "252--266",
	publisher     = "{ACM}",
	title         = "{On the Integrity of Databases with Incomplete Information}",
	year          = 1986,
}