@inproceedings{LICS-2008-BojanczykSS,
	author        = "Mikolaj Bojanczyk and Luc Segoufin and Howard Straubing",
	booktitle     = "{Proceedings of the 23rd Annual IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2008.46",
	isbn          = "978-0-7695-3183-0",
	pages         = "442--451",
	publisher     = "{IEEE Computer Society}",
	title         = "{Piecewise Testable Tree Languages}",
	year          = 2008,
}