@article{DLT-J-2004-DassowH05,
	author        = "Jürgen Dassow and Markus Holzer",
	doi           = "10.1142/S0129054105003212",
	journal       = "{International Journal of Foundations of Computer Science}",
	number        = 4,
	pages         = "645--662",
	publisher     = "{World Scientific}",
	title         = "{Language families defined by a ciliate bio-operation: hierarchies and decision problems}",
	volume        = 16,
	year          = 2005,
}