@inproceedings{PODS-2007-CateL,
	author        = "Balder ten Cate and Carsten Lutz",
	booktitle     = "{Proceedings of the 26th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1265530.1265541",
	isbn          = "978-1-59593-685-1",
	pages         = "73--82",
	publisher     = "{ACM}",
	title         = "{The complexity of query containment in expressive fragments of XPath 2.0}",
	year          = 2007,
}