@article{10_21136_CPMF_1940_120980,
     author = {Lerl, Karel},
     title = {O rekrea\v{c}n{\'\i} matematice},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {82--D91},
     year = {1940},
     volume = {69},
     number = {Suppl.},
     doi = {10.21136/CPMF.1940.120980},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1940.120980/}
}