@article{MZM_1986_40_6_a2,
     author = {A. N. Ostylovskii},
     title = {Periodic groups with countable subgroups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {722--725},
     year = {1986},
     volume = {40},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_6_a2/}
}