@article{PMFA_1956_1_4_a13,
     author = {Veselka, Josef},
     title = {Um\v{e}l\'a dru\v{z}ice {Zem\v{e}}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {422--430},
     year = {1956},
     volume = {1},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_4_a13/}
}