@article{DAN_1963_151_1_a4,
     author = {V. P. Gromyko},
     title = {A new criterion of specialty for $\pi d$-groups with a given number of classes of unattainable iso-ordic $\pi d$-subgroups},
     journal = {Doklady Akademii Nauk},
     pages = {23--26},
     publisher = {mathdoc},
     volume = {151},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a4/}
}