@article{DAN_1957_116_5_a14,
     author = {B. I. Stepanov and P. A. Apanasevich},
     title = {Classification of the secondary light emission},
     journal = {Doklady Akademii Nauk},
     pages = {772--775},
     publisher = {mathdoc},
     volume = {116},
     number = {5},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a14/}
}