@inproceedings{PODS-2007-FaginKPT,
	author        = "Ronald Fagin and Phokion G. Kolaitis and Lucian Popa and Wang Chiew Tan",
	booktitle     = "{Proceedings of the 26th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1265530.1265548",
	isbn          = "978-1-59593-685-1",
	pages         = "123--132",
	publisher     = "{ACM}",
	title         = "{Quasi-inverses of schema mappings}",
	year          = 2007,
}