@article{PMFA_1958_3_3_a6,
     author = {Schmidtmayer, Josef},
     title = {Dr\'ahy dru\v{z}ic},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {281--291},
     year = {1958},
     volume = {3},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1958_3_3_a6/}
}