@article{SF_1988__37_1_134922,
     author = {Gracinda M.S. Gomes},
     title = {Orthodox congruences on regular semigroups.},
     journal = {Semigroup forum},
     pages = {149--166},
     year = {1988},
     volume = {37},
     number = {1},
     zbl = {0638.20035},
     url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134922/}
}