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@article{MS_1954__76_2_a8, author = {{\CYRM}.{\CYRI}. {\CYRE}{\cyrl}{\cyrsftsn}{\cyrsh}{\cyri}{\cyrn}}, title = {{\CYRM}{\cyre}{\cyrt}{\cyro}{\cyrd} {\cyrs}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrv} {\cyrk}{\cyra}{\cyrch}{\cyre}{\cyrs}{\cyrt}{\cyrv}{\cyre}{\cyrn}{\cyrn}{\cyro}{\cyrishrt} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyri}{\cyri} {\cyrn}{\cyre}{\cyrp}{\cyro}{\cyrl}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra}}, journal = {Matemati\v{c}eskij sbornik}, pages = {323--330}, publisher = {mathdoc}, volume = {76}, number = {2}, year = {1954}, zbl = {0056.08802}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1954__76_2_a8/} }
М.И. Ельшин. Метод сравнения в качественной теории неполного дифференциального уравнения второго порядка. Matematičeskij sbornik, Tome 76 (1954) no. 2, pp. 323-330. http://geodesic.mathdoc.fr/item/MS_1954__76_2_a8/