@inproceedings{DLT-2007-OchmanskiS,
	author        = "Edward Ochmanski and Krystyna Stawikowska",
	booktitle     = "{Proceedings of the 11th International Conference on Developments in Language Theory}",
	doi           = "10.1007/978-3-540-73208-2_32",
	isbn          = "978-3-540-73207-5",
	pages         = "337--345",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Star Operation for Star-Free Trace Languages}",
	volume        = 4588,
	year          = 2007,
}