@article{PIM_1979_N_S_26_40_a37,
     author = {{\CYRM}{\cyri}{\cyrl}{\cyro}{\cyrsh} {\CYRT}{\cyro}{\cyrm}{\cyri}{\cyrch}},
     title = {{\CYRP}{\cyrr}{\cyri}{\cyrb}{\cyrl}{\cyri}{\cyrzh}{\cyrn}{\cyri}{\cyre} 2\ensuremath{\pi} {{\CYRP}{\cyre}{\cyrr}{\cyri}{\cyro}{\cyrd}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh}} {{\CYRF}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyrishrt}} {{\CYRU}{\cyrg}{\cyrl}{\cyro}{\cyrm}} {{\CYRI}{\cyrz}} {{\CYRS}{\cyri}{\cyrn}{\cyrg}{\cyru}{\cyrl}{\cyrya}{\cyrr}{\cyrn}{\cyrery}{\cyrh}} {{\CYRI}{\cyrn}{\cyrt}{\cyre}{\cyrg}{\cyrr}{\cyra}{\cyrl}{\cyro}{\cyrv}}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {297 },
     publisher = {mathdoc},
     volume = {_N_S_26},
     number = {40},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/PIM_1979_N_S_26_40_a37/}
}