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@article{SF_1981__23_134518, author = {P.M. Higgins}, title = {Epis are onto for generalized inverse semigroups.}, journal = {Semigroup forum}, pages = {255--260}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0475.20052}, url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134518/} }
P.M. Higgins. Epis are onto for generalized inverse semigroups.. Semigroup forum, Tome 23 (1981), pp. 255-260. http://geodesic.mathdoc.fr/item/SF_1981__23_134518/