@inproceedings{PODS-2008-FaginKNP,
	author        = "Ronald Fagin and Phokion G. Kolaitis and Alan Nash and Lucian Popa",
	booktitle     = "{Proceedings of the 27th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1376916.1376922",
	isbn          = "978-1-60558-108-8",
	pages         = "33--42",
	publisher     = "{ACM}",
	title         = "{Towards a theory of schema-mapping optimization}",
	year          = 2008,
}