@article{10_21136_CPM_1958_108631,
     author = {\v{C}ul{\'\i}k, Karel},
     title = {Pozn\'amky k teorii operac{\'\i}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {473--474},
     publisher = {mathdoc},
     volume = {083},
     number = {4},
     year = {1958},
     doi = {10.21136/CPM.1958.108631},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1958.108631/}
}