@inproceedings{CIAA-2011-BechetDF,
	author        = "Denis Béchet and Alexander Ja. Dikovsky and Annie Foret",
	booktitle     = "{Proceedings of the 16th International Conference on Implementation and Application of Automata}",
	doi           = "10.1007/978-3-642-22256-6_5",
	isbn          = "978-3-642-22255-9",
	pages         = "42--52",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Categorial Grammars with Iterated Types form a Strict Hierarchy of k-Valued Languages}",
	volume        = 6807,
	year          = 2011,
}