@inproceedings{WLC-2000-KelarevT,
	author        = "Andrei V. Kelarev and Peter G. Trotter",
	booktitle     = "{Proceedings of the Third International Colloquium on Words, Languages & Combinatorics}",
	isbn          = "978-9810249489",
	pages         = "228--239",
	publisher     = "{World Scientific}",
	title         = "{A Combinatorial Property of Languages and Monoids}",
	year          = 2000,
}