@article{DE_1969_5_10_a19,
     author = {I. Z. Shtokalo and N. P. Erugin},
     title = {{\CYRN}{\cyri}{\cyrk}{\cyro}{\cyrl}{\cyra}{\cyrishrt} {{\CYRN}{\cyri}{\cyrk}{\cyro}{\cyrl}{\cyra}{\cyre}{\cyrv}{\cyri}{\cyrch}} {{\CYRB}{\cyro}{\cyrg}{\cyro}{\cyrl}{\cyryu}{\cyrb}{\cyro}{\cyrv}} ({\cyrk}~60-{\cyrl}{\cyre}{\cyrt}{\cyri}{\cyryu} {\cyrs}{\cyro} {\cyrd}{\cyrn}{\cyrya} {\cyrr}{\cyro}{\cyrzh}{\cyrd}{\cyre}{\cyrn}{\cyri}{\cyrya})},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1901--1908},
     publisher = {mathdoc},
     volume = {5},
     number = {10},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_10_a19/}
}