@article{KVANT_2009_6_a3,
     author = {S. Tabachnikov and V. Timorin},
     title = {{\CYRP}{\cyrr}{\cyrya}{\cyrm}{\cyra}{\cyrya} {{\CYRS}{\cyri}{\cyrl}{\cyrsftsn}{\cyrv}{\cyre}{\cyrs}{\cyrt}{\cyrr}{\cyra}} ({\cyro}{\cyrk}{\cyro}{\cyrn}{\cyrch}{\cyra}{\cyrn}{\cyri}{\cyre})},
     journal = {Kvant},
     pages = {6--9},
     publisher = {mathdoc},
     number = {6},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2009_6_a3/}
}