@inproceedings{PODS-2003-FaginKP,
	author        = "Ronald Fagin and Phokion G. Kolaitis and Lucian Popa",
	booktitle     = "{Proceedings of the 22nd Symposium on Principles of Database Systems}",
	doi           = "10.1145/773153.773163",
	isbn          = "1-58113-670-6",
	pages         = "90--101",
	publisher     = "{ACM}",
	title         = "{Data exchange: getting to the core}",
	year          = 2003,
}