@article{PMFA_1961_6_2_a4,
     author = {Jel{\'\i}nek, Milo\v{s}},
     title = {Sv\v{e}tov\'y z\'ajem o vyu\v{c}ov\'an{\'\i} p\v{r}{\'\i}rodn{\'\i}m v\v{e}d\'am},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {105--109},
     year = {1961},
     volume = {6},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1961_6_2_a4/}
}