@INPROCEEDINGS {
	AUTHOR = "Marcelo Arenas and Pablo Barcel{\'o} and Juan Reutter",
	TITLE = "Query Languages for Data Exchange: Beyond Unions of Conjunctive Queries",
	EDITOR = "Ronald Fagin",
	BOOKTITLE = "12th International Conference on Database Theory (ICDT)",
	PAGES = "73-83",
	MONTH = "Mar",
	YEAR = "2009",
	ADDRESS = "Saint Petersburg, Russia",
	PUBLISHER = "ACM Press",
	SERIES ="ACM International Conference Proceeding Series",
	NUMBER = "361",
	ISBN = "978-1-60558-423-2",
	}