@article{DAN_1969_187_3_a4,
     author = {Ya. G. Berkovich},
     title = {Subgroups, normal divisors and epimorphic images of a finite $p$-group},
     journal = {Doklady Akademii Nauk},
     pages = {499--501},
     publisher = {mathdoc},
     volume = {187},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_3_a4/}
}