@inproceedings{DLT-2002-PetkovicCB,
	author        = "Tatjana Petkovic and Miroslav Ciric and Stojan Bogdanovic",
	booktitle     = "{Revised Papers of the Seventh International Conference on Developments in Language Theory}",
	doi           = "10.1007/3-540-45005-X_37",
	isbn          = "3-540-40431-7",
	pages         = "417--427",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Characteristic Semigroups of Directable Automata}",
	volume        = 2450,
	year          = 2002,
}