@misc{10_21136_CPMF_1931_123921,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {263--266},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1931},
     doi = {10.21136/CPMF.1931.123921},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1931.123921/}
}