@inproceedings{AFL-2008-JurgensenM,
	author        = "Helmut Jürgensen and Ian McQuillan",
	booktitle     = "{Proceedings of the 12th International Conference on Automata and Formal Languages}",
	isbn          = "978-963-311-367-7",
	pages         = "183--194",
	title         = "{Homomorphisms Preserving Types of Density}",
	year          = 2008,
}