@misc{10_21136_CPM_1969_117655,
     title = {\'Ulohy a probl\'emy},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {223--225},
     publisher = {mathdoc},
     volume = {094},
     number = {2},
     year = {1969},
     doi = {10.21136/CPM.1969.117655},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1969.117655/}
}