Voir la notice de l'article provenant de la source Math-Net.Ru
@article{KVANT_2016_5_a12, author = {K. Sechkar}, title = {{\CYRG}{\cyre}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyre} {\cyrd}{\cyro}{\cyrk}{\cyra}{\cyrz}{\cyra}{\cyrt}{\cyre}{\cyrl}{\cyrsftsn}{\cyrs}{\cyrt}{\cyrv}{\cyro} {\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyru}{\cyrl}{\cyrery}}, journal = {Kvant}, pages = {27}, publisher = {mathdoc}, number = {5}, year = {2016}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2016_5_a12/} }
K. Sechkar. Геометрическое доказательство формулы. Kvant, no. 5 (2016). http://geodesic.mathdoc.fr/item/KVANT_2016_5_a12/