@article{VLDB-2009-GottlobPS,
	author        = "Georg Gottlob and Reinhard Pichler and Vadim Savenkov",
	ee            = "http://www.vldb.org/pvldb/2/vldb09-923.pdf",
	journal       = "{Proceedings of the VLDB Endowment}",
	number        = 1,
	pages         = "1102--1113",
	title         = "{Normalization and Optimization of Schema Mappings}",
	volume        = 2,
	year          = 2009,
}