@article{10_21136_CPM_1955_108221,
     author = {H\'ajek, Otomar},
     title = {Funkcion\'aln{\'\i} rovnice trigonometrick\'ych funkc{\'\i}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {481--485},
     publisher = {mathdoc},
     volume = {080},
     number = {4},
     year = {1955},
     doi = {10.21136/CPM.1955.108221},
     mrnumber = {0089359},
     zbl = {0068.32003},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1955.108221/}
}