@article{DAN_1957_112_4_a16,
     author = {A. P. Nikol'skii},
     title = {On the geographic distribution of radio blackouts in high latitudes},
     journal = {Doklady Akademii Nauk},
     pages = {628--631},
     publisher = {mathdoc},
     volume = {112},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_4_a16/}
}