@article{MZM_1975_18_6_a9,
     author = {V. S. Monakhov},
     title = {Normal subgroups of biprimary groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {877--886},
     year = {1975},
     volume = {18},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_6_a9/}
}