@article{SF_1993__46_1_135209,
     author = {G.M.S. Gomes},
     title = {A characterization of the group congruences on a semigroup.},
     journal = {Semigroup forum},
     pages = {48--53},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1993},
     zbl = {0773.20028},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135209/}
}