@article{10_21136_CMJ_1969_100891,
     author = {Cs\'ak\'any, B\'ela and Poll\'ak, Gy\"orgy},
     title = {{\CYRO} {\cyrg}{\cyrr}{\cyra}{\cyrf}{\cyre} {\cyrp}{\cyro}{\cyrd}{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp} {\cyrk}{\cyro}{\cyrn}{\cyre}{\cyrch}{\cyrn}{\cyro}{\cyrishrt} {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyrery}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {241--247},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1969},
     doi = {10.21136/CMJ.1969.100891},
     mrnumber = {0249328},
     zbl = {0218.20019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1969.100891/}
}