@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/}
}