@article{PMFA_1956_1_1_a3,
     author = {Dobrotin, N. A.},
     title = {P\r{u}vod kosmick\'ych paprsk\r{u}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {23--25},
     year = {1956},
     volume = {1},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_1_a3/}
}