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@article{SF_1985__31_134753, author = {G.M.S. Gomes}, title = {R-unipotent congruences on regular semigroups.}, journal = {Semigroup forum}, pages = {265--280}, publisher = {mathdoc}, volume = {31}, year = {1985}, zbl = {0557.20035}, url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134753/} }
G.M.S. Gomes. R-unipotent congruences on regular semigroups.. Semigroup forum, Tome 31 (1985), pp. 265-280. http://geodesic.mathdoc.fr/item/SF_1985__31_134753/