@article{DLT-J-2010-JiraskovaM11,
	author        = "Galina Jirásková and Tomás Masopust",
	doi           = "10.1142/S0129054111008933",
	journal       = "{International Journal of Foundations of Computer Science}",
	number        = 7,
	pages         = "1639--1653",
	publisher     = "{World Scientific}",
	title         = "{Complexity in Union-Free Regular Languages}",
	volume        = 22,
	year          = 2011,
}