@article{10_21136_CPMF_1939_120744,
     author = {Lerl, Karel},
     title = {Pozn\'amky k metodice trigonometrie},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {163--D170},
     year = {1939},
     volume = {68},
     number = {Suppl.},
     doi = {10.21136/CPMF.1939.120744},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1939.120744/}
}