@misc{10_21136_CPMF_1947_122803,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {14--D16},
     year = {1947},
     volume = {72},
     number = {4},
     doi = {10.21136/CPMF.1947.122803},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1947.122803/}
}