@misc{10_21136_CPMF_1920_121353,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {208},
     year = {1920},
     volume = {49},
     number = {2-3},
     doi = {10.21136/CPMF.1920.121353},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1920.121353/}
}