@article{DAN_1971_196_2_a0,
     author = {Ya. G. Berkovich},
     title = {Subgroup and normal structure of a finite $p$-group},
     journal = {Doklady Akademii Nauk},
     pages = {255--258},
     publisher = {mathdoc},
     volume = {196},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_2_a0/}
}