@article{CMJ_1999__49_3_a1,
     author = {Je\v{z}ek, Jaroslav},
     title = {Some decidable congruences of free monoids},
     journal = {Czechoslovak Mathematical Journal},
     pages = {475--480},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {1999},
     mrnumber = {1707983},
     zbl = {1008.20049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1999__49_3_a1/}
}