@article{10_21136_CPMF_1926_121525,
     author = {Friedrich, J.},
     title = {Na okraj u\v{c}ebnic},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {221--222},
     year = {1926},
     volume = {55},
     number = {2},
     doi = {10.21136/CPMF.1926.121525},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1926.121525/}
}