@article{10_21136_CMJ_1961_100452,
     author = {Petrov, P. I.},
     title = {{\CYRK}{\cyrl}{\cyra}{\cyrs}{\cyrs}{\cyri}{\cyrf}{\cyri}{\cyrk}{\cyra}{\cyrc}{\cyri}{\cyrya} {\cyrt}{\cyrr}{\cyre}{\cyrh}{\cyrm}{\cyre}{\cyrr}{\cyrn}{\cyrery}{\cyrh} {\cyrk}{\cyro}{\cyrn}{\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyrn}{\cyro}-{\cyrp}{\cyrl}{\cyro}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrr}{\cyri}{\cyrm}{\cyra}{\cyrn}{\cyro}{\cyrv}{\cyrery}{\cyrh} {\cyrp}{\cyrr}{\cyro}{\cyrs}{\cyrt}{\cyrr}{\cyra}{\cyrn}{\cyrs}{\cyrt}{\cyrv}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {161--164},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1961},
     doi = {10.21136/CMJ.1961.100452},
     mrnumber = {0123271},
     zbl = {0100.18001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1961.100452/}
}