@misc{DE_1997_33_8_a21,
     title = {{\CYRM}{\cyre}{\cyrzh}{\cyrd}{\cyru}{\cyrn}{\cyra}{\cyrr}{\cyro}{\cyrd}{\cyrn}{\cyra}{\cyrya} {\cyrk}{\cyro}{\cyrn}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyrya}, {\cyrp}{\cyro}{\cyrs}{\cyrv}{\cyrya}{\cyrshch}{\cyre}{\cyrn}{\cyrn}{\cyra}{\cyrya} 90-{\cyrl}{\cyre}{\cyrt}{\cyri}{\cyryu} {\cyrs}{\cyro} {\cyrd}{\cyrn}{\cyrya} {\cyrr}{\cyro}{\cyrzh}{\cyrd}{\cyre}{\cyrn}{\cyri}{\cyrya} {{\CYRL}.\,{\CYRS}.~{\CYRP}{\cyro}{\cyrn}{\cyrt}{\cyrr}{\cyrya}{\cyrg}{\cyri}{\cyrn}{\cyra}}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1147--1148},
     publisher = {mathdoc},
     volume = {33},
     number = {8},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_8_a21/}
}