@article{ITA_2012__46_4_573_0,
     author = {Kl{\'\i}ma, Ond\v{r}ej and Pol\'ak, Libor},
     title = {On biautomata},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {573--592},
     publisher = {EDP-Sciences},
     volume = {46},
     number = {4},
     year = {2012},
     doi = {10.1051/ita/2012014},
     mrnumber = {3107864},
     zbl = {1279.68238},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita/2012014/}
}