@article{ITA_2008__42_3_583_0,
     author = {Kl{\'\i}ma, Ond\v{r}ej and Pol\'ak, Libor},
     title = {On varieties of literally idempotent languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {583--598},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {3},
     year = {2008},
     doi = {10.1051/ita:2008020},
     mrnumber = {2434036},
     zbl = {1151.68032},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2008020/}
}