@article{10_21136_CPMF_1938_120816,
     author = {Lerl, Karel},
     title = {K metodice goniometrick\'ych funkc{\'\i}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {D18},
     publisher = {mathdoc},
     volume = {67},
     number = {Suppl.},
     year = {1938},
     doi = {10.21136/CPMF.1938.120816},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1938.120816/}
}