@inproceedings{PODS-2003-Segoufin,
	author        = "Luc Segoufin",
	booktitle     = "{Proceedings of the 22nd Symposium on Principles of Database Systems}",
	doi           = "10.1145/773153.773170",
	isbn          = "1-58113-670-6",
	pages         = "167--178",
	publisher     = "{ACM}",
	title         = "{Typing and querying XML documents: some complexity bounds}",
	year          = 2003,
}