@article{10_21136_CPM_1968_117639,
     author = {Cep\'ak, Karel},
     title = {Obecn\'e vzorce pro p\v{r}evod sou\v{c}inu kosin\r{u} $n$-\v{c}{\'\i}sel na sou\v{c}et kosin\r{u}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {482--483},
     publisher = {mathdoc},
     volume = {093},
     number = {4},
     year = {1968},
     doi = {10.21136/CPM.1968.117639},
     mrnumber = {0352554},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1968.117639/}
}