@article{10_21136_CPMF_1908_123011,
     author = {Haas, Marian},
     title = {Pravideln\'e mnoho\'uheln{\'\i}ky a \v{c}{\'\i}slo {Ludolfovo}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {81--84},
     year = {1908},
     volume = {37},
     number = {1},
     doi = {10.21136/CPMF.1908.123011},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1908.123011/}
}