Voir la notice de l'article provenant de la source Math-Net.Ru
@article{KVANT_2014_4_a4, author = {E. Epifanov}, title = {{\guillemotleft}{\CYRP}{\cyro}{\cyrr}{\cyrt}{\cyrr}{\cyre}{\cyrt}{\guillemotright} {\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyra} $\pi$}, journal = {Kvant}, pages = {31--37}, publisher = {mathdoc}, number = {4}, year = {2014}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2014_4_a4/} }
E. Epifanov. «Портрет» числа $\pi$. Kvant, no. 4 (2014), pp. 31-37. http://geodesic.mathdoc.fr/item/KVANT_2014_4_a4/