@article{VCHGU_1999_4_a14,
     author = {E. L. Pervova},
     title = {{\CYRI}{\cyrn}{\cyrd}{\cyre}{\cyrk}{\cyrs}{\cyrery} {\cyrp}{\cyro}{\cyrd}{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp} {\cyrs}{\cyrt}{\cyre}{\cyrp}{\cyre}{\cyrn}{\cyre}{\cyrishrt} {\cyrv} {{\CYRA}{\CYRT}-{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyre}} {\cyrp}{\cyro}{\cyrch}{\cyrt}{\cyri}
},
     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
     pages = {174--182},
     publisher = {mathdoc},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VCHGU_1999_4_a14/}
}