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@article{DAN_1963_149_3_a14, author = {A. L. Shmel'kin}, title = {The semigroup of group varieties}, journal = {Doklady Akademii Nauk}, pages = {543--545}, publisher = {mathdoc}, volume = {149}, number = {3}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_3_a14/} }
A. L. Shmel'kin. The semigroup of group varieties. Doklady Akademii Nauk, Tome 149 (1963) no. 3, pp. 543-545. http://geodesic.mathdoc.fr/item/DAN_1963_149_3_a14/