@ARTICLE {
	AUTHOR = "Marcelo Arenas and Jorge P{\'e}rez and Cristian Riveros and Juan Reutter",
	TITLE ="Query Language-based Inverses of Schema Mappings: Semantics, Computation, and Closure Properties",
	JOURNAL = "The VLDB Journal (VLDBJ)",
	VOLUME = "21",
	NUMBER = "6",
	PAGES = "823-842",
	YEAR = "2012",
	PUBLISHER = "Springer",
	ADDRESS = "New York, NY, USA",
	ISSN = "1066-8888"
	}