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@article{IVM_1973_12_a7, author = {B. M. Pogrebinskii and Ya. G. Berkovich}, title = {The $\Theta$-length of a~finite group}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {57--63}, publisher = {mathdoc}, number = {12}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1973_12_a7/} }
B. M. Pogrebinskii; Ya. G. Berkovich. The $\Theta$-length of a~finite group. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1973), pp. 57-63. http://geodesic.mathdoc.fr/item/IVM_1973_12_a7/