@article{PMFA_1956_1_1_a9,
     author = {Rykov, S.},
     title = {Infra\v{c}erven\'e paprsky},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {73--76},
     year = {1956},
     volume = {1},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_1_a9/}
}