@article{ARM_1980__16_2_a4,
     author = {Nikolova, T. S. and Bajnov, Drumi Dimitrov},
     title = {{\CYRP}{\cyrr}{\cyri}{\cyrm}{\cyre}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyre} {\cyrm}{\cyre}{\cyrt}{\cyro}{\cyrd}{\cyra} {\cyrd}{\cyrv}{\cyru}{\cyrs}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrn}{\cyrn}{\cyri}{\cyrh} {\cyrp}{\cyrr}{\cyri}{\cyrb}{\cyrl}{\cyri}{\cyrzh}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrd}{\cyrl}{\cyrya} {\cyro}{\cyrt}{\cyrery}{\cyrs}{\cyrk}{\cyra}{\cyrn}{\cyri}{\cyrya} {\cyrp}{\cyre}{\cyrr}{\cyri}{\cyro}{\cyrd}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrr}{\cyre}{\cyrsh}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrs} {\cyro}{\cyrt}{\cyrk}{\cyrl}{\cyro}{\cyrn}{\cyrya}{\cyryu}{\cyrshch}{\cyri}{\cyrm}{\cyrs}{\cyrya} {\cyra}{\cyrr}{\cyrg}{\cyru}{\cyrm}{\cyre}{\cyrn}{\cyrt}{\cyro}{\cyrm}},
     journal = {Archivum mathematicum},
     pages = {105--113},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1980},
     mrnumber = {594673},
     zbl = {0457.34051},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ARM_1980__16_2_a4/}
}