@inproceedings{LATA-2011-SalomaaSY,
	author        = "Arto Salomaa and Kai Salomaa and Sheng Yu",
	booktitle     = "{Proceedings of the Fifth International Conference on Language and Automata Theory and Applications}",
	doi           = "10.1007/978-3-642-21254-3_39",
	isbn          = "978-3-642-21253-6",
	pages         = "489--498",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Undecidability of the State Complexity of Composed Regular Operations}",
	volume        = 6638,
	year          = 2011,
}