@inproceedings{AFL-2008-AfoninK,
	author        = "Sergey Afonin and Elena Khazova",
	booktitle     = "{Proceedings of the 12th International Conference on Automata and Formal Languages}",
	isbn          = "978-963-311-367-7",
	pages         = "61--73",
	title         = "{Semigroups of regular languages over a one letter alphabet are rational}",
	year          = 2008,
}