@inproceedings{SIGMOD-2009-MeccaPR,
	author        = "Giansalvatore Mecca and Paolo Papotti and Salvatore Raunich",
	booktitle     = "{Proceedings of the 27th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1559845.1559914",
	isbn          = "978-1-60558-551-2",
	pages         = "655--668",
	publisher     = "{ACM}",
	title         = "{Core schema mappings}",
	year          = 2009,
}