@article{10_21136_CMJ_1986_102102,
     author = {Bajnov, Drumi Dimitrov and Simeonov, Pavel S.},
     title = {{\CYRI}{\cyrn}{\cyrt}{\cyre}{\cyrg}{\cyrr}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyri} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyrn}{\cyre}{\cyrr}{\cyra}{\cyrv}{\cyre}{\cyrn}{\cyrs}{\cyrt}{\cyrv}{\cyra} {\cyrd}{\cyrl}{\cyrya} {\cyro}{\cyrd}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyrs}{\cyra} {\cyrk}{\cyru}{\cyrs}{\cyro}{\cyrch}{\cyrn}{\cyro}-{\cyrn}{\cyre}{\cyrp}{\cyrr}{\cyre}{\cyrr}{\cyrery}{\cyrv}{\cyrn}{\cyrery}{\cyrh} {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyrishrt}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {417--426},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1986},
     doi = {10.21136/CMJ.1986.102102},
     mrnumber = {847769},
     zbl = {0613.34007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1986.102102/}
}