@misc{10_21136_CPM_1974_108210,
     title = {\'Ulohy a probl\'emy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {90--93},
     year = {1974},
     volume = {99},
     number = {1},
     doi = {10.21136/CPM.1974.108210},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1974.108210/}
}