Geodesic
An alternative principle for the existence of periodic solutions for differential equations with retarded argument
Doklady Akademii Nauk, Tome 152 (1963) no. 4, pp. 801-804.

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     author = {M. A. Krasnosel'skii},
     title = {An alternative principle for the existence of periodic solutions for differential equations with retarded argument},
     journal = {Doklady Akademii Nauk},
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     volume = {152},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a7/}
}
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M. A. Krasnosel'skii. An alternative principle for the existence of periodic solutions for differential equations with retarded argument. Doklady Akademii Nauk, Tome 152 (1963) no. 4, pp. 801-804. http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a7/