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@article{SF_1984__29_134675, author = {P.M. Higgins}, title = {Epimorphisms, permutation identities and finite semigroups.}, journal = {Semigroup forum}, pages = {87--98}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0546.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134675/} }
P.M. Higgins. Epimorphisms, permutation identities and finite semigroups.. Semigroup forum, Tome 29 (1984), pp. 87-98. http://geodesic.mathdoc.fr/item/SF_1984__29_134675/