Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MP_2014_a6, author = {G. A. Gal'perin}, title = {{\CYRB}{\cyri}{\cyrl}{\cyrsftsn}{\cyrya}{\cyrr}{\cyrd}{\cyrn}{\cyrery}{\cyre} {\cyrsh}{\cyra}{\cyrr}{\cyrery} {\cyrv}{\cyrery}{\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyrya}{\cyryu}{\cyrt} $\pi$}, journal = {Matematicheskoe Prosveshchenie}, pages = {180--204}, publisher = {mathdoc}, year = {2014}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MP_2014_a6/} }
G. A. Gal'perin. Бильярдные шары вычисляют $\pi$. Matematicheskoe Prosveshchenie, Matematicheskoe Prosveshchenie (2014), pp. 180-204. http://geodesic.mathdoc.fr/item/MP_2014_a6/