@article{10_21136_CPMF_1936_123696,
     author = {Charfreitag, Vratislav},
     title = {Pozn\'amky k pokus\r{u}m v u\v{c}ebnici {Pet{\'\i}rov\v{e}-\v{S}mokov\v{e}.} {[IV.]}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {26--D29},
     year = {1936},
     volume = {65},
     number = {1},
     doi = {10.21136/CPMF.1936.123696},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1936.123696/}
}