Ondrej Klíma, Libor Polák
Literally idempotent languages and their varieties — two letter case
AFL, 2008.
@inproceedings{AFL-2008-KlimaP,
author = "Ondrej Klíma and Libor Polák",
booktitle = "{Proceedings of the 12th International Conference on Automata and Formal Languages}",
isbn = "978-963-311-367-7",
pages = "220--231",
title = "{Literally idempotent languages and their varieties — two letter case}",
year = 2008,
}