@article{SF_1981__23_134529,
     author = {D. Th\'erien},
     title = {Recognizable languages and congruences.},
     journal = {Semigroup forum},
     pages = {371--374},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0501.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134529/}
}