Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{PMFA_2015__60_2_a2, author = {Brandts, Jan and Cihangir, Apo and K\v{r}{\'\i}\v{z}ek, Michal}, title = {Sou\v{c}et \'uhl\r{u} ve \v{c}ty\v{r}st\v{e}nu}, journal = {Pokroky matematiky, fyziky a astronomie}, pages = {113--122}, publisher = {mathdoc}, volume = {60}, number = {2}, year = {2015}, zbl = {06499279}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/PMFA_2015__60_2_a2/} }
Brandts, Jan; Cihangir, Apo; Křížek, Michal. Součet úhlů ve čtyřstěnu. Pokroky matematiky, fyziky a astronomie, Tome 60 (2015) no. 2, pp. 113-122. http://geodesic.mathdoc.fr/item/PMFA_2015__60_2_a2/