Some criteria for the existence of periodic solutions of ordinary differential equations
Doklady Akademii Nauk, Tome 156 (1964) no. 5, pp. 1022-1024.

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     author = {M. A. Krasnosel'skii and V. V. Strygin},
     title = {Some criteria for the existence of periodic solutions of ordinary differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1022--1024},
     publisher = {mathdoc},
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     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_5_a8/}
}
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M. A. Krasnosel'skii; V. V. Strygin. Some criteria for the existence of periodic solutions of ordinary differential equations. Doklady Akademii Nauk, Tome 156 (1964) no. 5, pp. 1022-1024. http://geodesic.mathdoc.fr/item/DAN_1964_156_5_a8/