Epis are onto for generalized inverse semigroups.
Higgins, P.M.
Semigroup forum, Tome 23 (1981), p. 255-260 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1981-01-01
EUDML-ID : urn:eudml:doc:134518 
@article{GDZPPN001255185,
     title = {Epis are onto for generalized inverse semigroups.},
     journal = {Semigroup forum},
     volume = {23},
     year = {1981},
     pages = {255-260},
     zbl = {0475.20052},
     url = {http://dml.mathdoc.fr/item/GDZPPN001255185}
}

Higgins, P.M. Epis are onto for generalized inverse semigroups.. Semigroup forum, Tome 23 (1981) pp. 255-260. http://gdmltest.u-ga.fr/item/GDZPPN001255185/