@inproceedings{PODS-1986-Naqvi,
	author        = "Shamim A. Naqvi",
	booktitle     = "{Proceedings of the Fifth Symposium on Principles of Database Systems}",
	doi           = "10.1145/6012.15408",
	isbn          = "0-89791-179-2",
	pages         = "114--122",
	publisher     = "{ACM}",
	title         = "{Negation as Failure for First-Order Queries}",
	year          = 1986,
}