@inproceedings{PODS-1995-Libkin,
	author        = "Leonid Libkin",
	booktitle     = "{Proceedings of the 14th Symposium on Principles of Database Systems}",
	doi           = "10.1145/212433.220217",
	isbn          = "0-89791-730-8",
	pages         = "219--230",
	publisher     = "{ACM Press}",
	title         = "{Normalizing Incomplete Databases}",
	year          = 1995,
}