@article{IVM_1960_6_a25,
     author = {V. I. Ushakov},
     title = {$P$-radical groups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {233--238},
     year = {1960},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_6_a25/}
}