@article{DAN_1971_196_1_a21,
     author = {L. O. Atovmyan and O. N. Krasochka},
     title = {The structure of},
     journal = {Doklady Akademii Nauk},
     pages = {91--92},
     year = {1971},
     volume = {196},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_1_a21/}
}