@inproceedings{ICALP-1988-Diekert,
	author        = "Volker Diekert",
	booktitle     = "{Proceedings of the 15th International Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/3-540-19488-6_115",
	isbn          = "3-540-19488-6",
	pages         = "176--187",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Transitive Orientations, Möbius Functions, and Complete Semi-Thue Systems for Free Partially Commutative Monoids}",
	volume        = 317,
	year          = 1988,
}