@article{MP_1961_a29,
     author = {Ya. I. Rivkind},
     title = {{\CYRK}{\cyrr}{\cyru}{\cyrzh}{\cyro}{\cyrk} {\cyrp}{\cyro} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrm}{\cyru} {\cyra}{\cyrn}{\cyra}{\cyrl}{\cyri}{\cyrz}{\cyru} {{\cyrv}~{\CYRG}{\cyrr}{\cyro}{\cyrd}{\cyrn}{\cyre}{\cyrn}{\cyrs}{\cyrk}{\cyro}{\cyrm}} {\cyrp}{\cyre}{\cyrd}{\cyra}{\cyrg}{\cyro}{\cyrg}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrm} {\cyri}{\cyrn}{\cyrs}{\cyrt}{\cyri}{\cyrt}{\cyru}{\cyrt}{\cyre}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {267--280},
     publisher = {mathdoc},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_1961_a29/}
}