@article{PMFA_1958_3_4_a9,
     author = {Guth, V.},
     title = {Um\v{e}l\'e dru\v{z}ice (z hlediska nebesk\'e mechaniky)},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {448--457},
     year = {1958},
     volume = {3},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1958_3_4_a9/}
}