@inproceedings{FoSSaCS-1998-Matz,
	author        = "Oliver Matz",
	booktitle     = "{Proceedings of the First International Conference on Foundations of Software Science and Computation Structures}",
	doi           = "10.1007/BFb0053551",
	isbn          = "3-540-64300-1",
	pages         = "203--210",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{On Piecewise Testable, Starfree, and Recognizable Picture Languages}",
	volume        = 1378,
	year          = 1998,
}