@article{IVM_1963_3_a5,
     author = {V. P. Gromyko},
     title = {Finite groups for which the number of different prime $\pi$-divisors of the order is equal to the number of classes of non-invariant conjugate $\pi d$-subgroups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {40--43},
     publisher = {mathdoc},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_3_a5/}
}