Geodesic
The existence of saddle periodic solutions of Duffing's equation without dissipation
Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 1145-1148.

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@article{DE_1977_13_6_a25,
     author = {V. E. Chernyshev},
     title = {The existence of saddle periodic solutions of {Duffing's} equation without dissipation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1145--1148},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a25/}
}
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V. E. Chernyshev. The existence of saddle periodic solutions of Duffing's equation without dissipation. Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 1145-1148. http://geodesic.mathdoc.fr/item/DE_1977_13_6_a25/