@misc{10_21136_CPMF_1949_133456,
     title = {Spolkov\'y v\v{e}stn{\'\i}k},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {91--D96},
     year = {1949},
     volume = {74},
     number = {1},
     doi = {10.21136/CPMF.1949.133456},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1949.133456/}
}