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@article{DAN_1961_138_5_a9, author = {Ya. D. Polovitskii}, title = {Locally extremal groups and groups with $\pi$-minimality condition}, journal = {Doklady Akademii Nauk}, pages = {1022--1024}, publisher = {mathdoc}, volume = {138}, number = {5}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_5_a9/} }
Ya. D. Polovitskii. Locally extremal groups and groups with $\pi$-minimality condition. Doklady Akademii Nauk, Tome 138 (1961) no. 5, pp. 1022-1024. http://geodesic.mathdoc.fr/item/DAN_1961_138_5_a9/