@misc{10_21136_CPMF_1921_109184,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {214--216},
     year = {1921},
     volume = {50},
     number = {2-3},
     doi = {10.21136/CPMF.1921.109184},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1921.109184/}
}