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@article{MP_2001_a10, author = {G. A. Gal'perin}, title = {{\CYRB}{\cyri}{\cyrl}{\cyrl}{\cyri}{\cyra}{\cyrr}{\cyrd}{\cyrn}{\cyra}{\cyrya} {\cyrd}{\cyri}{\cyrn}{\cyra}{\cyrm}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyra}{\cyrya} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyra} {\cyrd}{\cyrl}{\cyrya} {\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyra}~$\pi$}, journal = {Matematicheskoe Prosveshchenie}, pages = {137--138}, publisher = {mathdoc}, year = {2001}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MP_2001_a10/} }
G. A. Gal'perin. Биллиардная динамическая система для числа~$\pi$. Matematicheskoe Prosveshchenie, Matematicheskoe Prosveshchenie (2001), pp. 137-138. http://geodesic.mathdoc.fr/item/MP_2001_a10/