@article{DE_1969_5_2_a21,
     author = {V. A. Il'in and L. D. Kudryavtsev},
     title = {{\CYRR}{\cyre}{\cyrc}{\cyre}{\cyrn}{\cyrz}{\cyri}{\cyrya} {\cyrn}{\cyra} {\cyrm}{\cyro}{\cyrn}{\cyro}{\cyrg}{\cyrr}{\cyra}{\cyrf}{\cyri}{\cyryu} {{\CYRV}.\,{\CYRD}.~{\CYRK}{\cyru}{\cyrp}{\cyrr}{\cyra}{\cyrd}{\cyrz}{\cyre},} {{\CYRT}.\,{\CYRG}.~{\CYRG}{\cyre}{\cyrg}{\cyre}{\cyrl}{\cyri}{\cyra},} {{\CYRM}.\,{\CYRO}.~{\CYRB}{\cyra}{\cyrsh}{\cyre}{\cyrl}{\cyre}{\cyrishrt}{\cyrsh}{\cyrv}{\cyri}{\cyrl}{\cyri},} {{\CYRT}.\,{\CYRV}.~{\CYRB}{\cyru}{\cyrr}{\cyrch}{\cyru}{\cyrl}{\cyra}{\cyrd}{\cyrz}{\cyre}} {{\guillemotleft}{\CYRT}{\cyrr}{\cyre}{\cyrh}{\cyrm}{\cyre}{\cyrr}{\cyrn}{\cyrery}{\cyre}} {\cyrz}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrishrt} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyri}{\cyri} {\cyru}{\cyrp}{\cyrr}{\cyru}{\cyrg}{\cyro}{\cyrs}{\cyrt}{\cyri}{\guillemotright}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {395--397},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_2_a21/}
}