Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@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}, publisher = {mathdoc}, volume = {06}, number = {1}, year = {1998}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_1998__6_1_a2/} }
Kuřina, František. Heronův vzorec a kosinová věta. Učitel matematiky, Tome 06 (1998) no. 1, pp. 16-17. http://geodesic.mathdoc.fr/item/UM_1998__6_1_a2/