@inproceedings{SIGMOD-2004-YuP,
	author        = "Cong Yu and Lucian Popa",
	booktitle     = "{Proceedings of the 32nd ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1007568.1007611",
	isbn          = "1-58113-859-8",
	pages         = "371--382",
	publisher     = "{ACM}",
	title         = "{Constraint-Based XML Query Rewriting For Data Integration}",
	year          = 2004,
}