@inproceedings{PODS-2010-GeladeIMN,
	author        = "Wouter Gelade and Tomasz Idziaszek and Wim Martens and Frank Neven",
	booktitle     = "{Proceedings of the 29th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1807085.1807118",
	isbn          = "978-1-4503-0033-9",
	pages         = "251--260",
	publisher     = "{ACM}",
	title         = "{Simplifying XML schema: single-type approximations of regular tree languages}",
	year          = 2010,
}