@article{DAN_1968_179_1_a1,
     author = {Ya. G. Berkovich},
     title = {The structure of a group and the structure of its subgroups},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {179},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_1_a1/}
}