Geodesic
A mixture of the Leray–Schauder and the Poincaré–Andronov methods in the problem of periodic solutions of ordinary differential equations
Differencialʹnye uravneniâ, Tome 35 (1999) no. 12, pp. 1709-1711 
V. V. Filippov. A mixture of the Leray–Schauder and the Poincaré–Andronov methods in the problem of periodic solutions of ordinary differential equations. Differencialʹnye uravneniâ, Tome 35 (1999) no. 12, pp. 1709-1711. http://geodesic.mathdoc.fr/item/DE_1999_35_12_a14/
@article{DE_1999_35_12_a14,
     author = {V. V. Filippov},
     title = {A mixture of the {Leray{\textendash}Schauder} and the {Poincar\'e{\textendash}Andronov} methods in the problem of periodic solutions of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1709--1711},
     year = {1999},
     volume = {35},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_12_a14/}
}
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