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@article{SF_1995__50_3_135370, author = {M. Mangold}, title = {E-varieties of regular semigroups, relatively bifree objects and fully invariant congruences.}, journal = {Semigroup forum}, pages = {105--116}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1995}, zbl = {0821.20044}, url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135370/} }
M. Mangold. E-varieties of regular semigroups, relatively bifree objects and fully invariant congruences.. Semigroup forum, Tome 50 (1995) no. 3, pp. 105-116. http://geodesic.mathdoc.fr/item/SF_1995__50_3_135370/