@article{10_21136_CMJ_1963_100576,
     author = {Petrov, P. I.},
     title = {{\CYRD}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyri}{\cyrn}{\cyrv}{\cyra}{\cyrr}{\cyri}{\cyra}{\cyrn}{\cyrt}{\cyrery} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra} {\cyrd}{\cyrv}{\cyru}{\cyrm}{\cyre}{\cyrr}{\cyrn}{\cyrery}{\cyrh} {\cyrp}{\cyrr}{\cyro}{\cyrs}{\cyrt}{\cyrr}{\cyra}{\cyrn}{\cyrs}{\cyrt}{\cyrv} {\cyrs}{\cyri}{\cyrm}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrishrt} {\cyra}{\cyrf}{\cyrf}{\cyri}{\cyrn}{\cyrn}{\cyro}{\cyrishrt} {\cyrs}{\cyrv}{\cyrya}{\cyrz}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyri} {\cyri}{\cyrh} {\cyrp}{\cyrr}{\cyri}{\cyrm}{\cyre}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {427--434},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1963},
     doi = {10.21136/CMJ.1963.100576},
     mrnumber = {0158325},
     zbl = {0125.39603},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1963.100576/}
}