@misc{10_21136_CPMF_1891_108979,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {52--53},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1891},
     doi = {10.21136/CPMF.1891.108979},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1891.108979/}
}