%0 Journal Article %A Ježek, Jaroslav %T Some decidable congruences of free monoids %J Czechoslovak Mathematical Journal %D 1999 %P 475-480 %V 49 %N 3 %U http://geodesic.mathdoc.fr/item/CMJ_1999_49_3_a1/ %G en %F CMJ_1999_49_3_a1