@article{MZM_1972_12_5_a8,
     author = {V. N. Shokuev},
     title = {An expression for the number of subgroups of a given order of a finite $p$-group},
     journal = {Matemati\v{c}eskie zametki},
     pages = {561--568},
     publisher = {mathdoc},
     volume = {12},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_12_5_a8/}
}