@inproceedings{ICALP-1972-Lentin,
	author        = "André Lentin",
	booktitle     = "{Proceedings of the Colloquium on Automata, Languages and Programming}",
	isbn          = "0-7204-2074-1",
	pages         = "67--85",
	title         = "{Equations in Free Monoids}",
	year          = 1972,
}