@article{VCHGU_1991_1_a18,
     author = {S. A. Avdonin and O. A. Gorshkova},
     title = {{\CYRO}{\cyrb} {\cyro}{\cyrt}{\cyrn}{\cyro}{\cyrs}{\cyri}{\cyrt}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrishrt} {\cyri} {\cyrp}{\cyro}{\cyrl}{\cyrn}{\cyro}{\cyrishrt} {\cyrk}{\cyrv}{\cyra}{\cyrz}{\cyri}{\cyru}{\cyrp}{\cyrr}{\cyra}{\cyrv}{\cyrl}{\cyrya}{\cyre}{\cyrm}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyrp}{\cyra}{\cyrr}{\cyra}{\cyrb}{\cyro}{\cyrl}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm} {\cyrs} {\cyrz}{\cyra}{\cyrp}{\cyra}{\cyrz}{\cyrd}{\cyrery}{\cyrv}{\cyra}{\cyrn}{\cyri}{\cyre}{\cyrm}},
     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
     pages = {141--142},
     publisher = {mathdoc},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VCHGU_1991_1_a18/}
}