@misc{PMFA_1961_6_5_a5,
     title = {Zaj{\'\i}mavosti z v\v{e}dy a techniky},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {287--288},
     year = {1961},
     volume = {6},
     number = {5},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1961_6_5_a5/}
}