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@article{MS_1964__105_2_a7, author = {{\CYRA}.{\CYRV}. {\CYRD}{\cyrr}{\cyra}{\cyrg}{\cyri}{\cyrl}{\cyre}{\cyrv}}, title = {{\CYRO} {\cyrn}{\cyre}{\cyrl}{\cyri}{\cyrn}{\cyre}{\cyrishrt}{\cyrn}{\cyrery}{\cyrh} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrh} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra}}, journal = {Matemati\v{c}eskij sbornik}, pages = {309--320}, publisher = {mathdoc}, volume = {105}, number = {2}, year = {1964}, zbl = {0117.05802}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1964__105_2_a7/} }
А.В. Драгилев. О нелинейных системах второго порядка. Matematičeskij sbornik, Tome 105 (1964) no. 2, pp. 309-320. http://geodesic.mathdoc.fr/item/MS_1964__105_2_a7/