@misc{10_21136_CPMF_1889_123283,
     title = {\'Ulohy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {87--89},
     year = {1889},
     volume = {18},
     number = {2},
     doi = {10.21136/CPMF.1889.123283},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1889.123283/}
}