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@article{DAN_1972_203_6_a3, author = {Yu. L. Ershov}, title = {Elementary group theories}, journal = {Doklady Akademii Nauk}, pages = {1240--1243}, publisher = {mathdoc}, volume = {203}, number = {6}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_6_a3/} }
Yu. L. Ershov. Elementary group theories. Doklady Akademii Nauk, Tome 203 (1972) no. 6, pp. 1240-1243. http://geodesic.mathdoc.fr/item/DAN_1972_203_6_a3/