@inproceedings{PODS-2007-FiliotNTT,
	author        = "Emmanuel Filiot and Joachim Niehren and Jean-Marc Talbot and Sophie Tison",
	booktitle     = "{Proceedings of the 26th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1265530.1265559",
	isbn          = "978-1-59593-685-1",
	pages         = "205--214",
	publisher     = "{ACM}",
	title         = "{Polynomial time fragments of XPath with variables}",
	year          = 2007,
}