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@article{SF_1995__50_3_135391, author = {A.V. Kelarev}, title = {Applications of epigroups to graded ring theory.}, journal = {Semigroup forum}, pages = {327--350}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1995}, zbl = {0824.16031}, url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135391/} }
A.V. Kelarev. Applications of epigroups to graded ring theory.. Semigroup forum, Tome 50 (1995) no. 3, pp. 327-350. http://geodesic.mathdoc.fr/item/SF_1995__50_3_135391/