@misc{PMFA_1956_1_4_a23,
     title = {Zaj{\'\i}mavosti},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {481--488},
     year = {1956},
     volume = {1},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_4_a23/}
}