Literally idempotent languages and their varieties - two letter case

Ondrej Klíma, Libor Polák. Literally idempotent languages and their varieties - two letter case. In Erzsébet Csuhaj-Varjú, Zoltán Ésik, editors, Automata and Formal Languages, 12th International Conference, AFL 2008, Balatonfüred, Hungary, May 27-30, 2008, Proceedings. pages 220-231, 2008.

Abstract

Abstract is missing.