@inproceedings{SIGMOD-2007-ZhouGBN,
	author        = "Xuan Zhou and Julien Gaugaz and Wolf-Tilo Balke and Wolfgang Nejdl",
	booktitle     = "{Proceedings of the 25th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1247480.1247541",
	isbn          = "978-1-59593-686-8",
	pages         = "545--556",
	publisher     = "{ACM}",
	title         = "{Query relaxation using malleable schemas}",
	year          = 2007,
}