@article{UM_1998_6_1_a2,
     author = {Ku\v{r}ina, Franti\v{s}ek},
     title = {Heron\r{u}v vzorec a kosinov\'a v\v{e}ta},
     journal = {U\v{c}itel matematiky},
     pages = {16--17},
     year = {1998},
     volume = {6},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1998_6_1_a2/}
}