Geodesic
A Note on Forced Oscillations in Systems on a Plane
Russian journal of nonlinear dynamics, Tome 19 (2023) no. 3, pp. 383-388.

Voir la notice de l'article provenant de la source Math-Net.Ru

A sufficient condition for the existence of forced oscillations in nonautonomous systems on a plane is presented under the assumption that the magnitude of the nonautonomous perturba- tion is small. An advantage of the results presented over analytic methods is that they can be applied in degenerate systems as well.
Keywords: periodic systems, forced oscillations, systems on a plane, degenerate systems, center. 
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I. Yu. Polekhin. A Note on Forced Oscillations in Systems on a Plane. Russian journal of nonlinear dynamics, Tome 19 (2023) no. 3, pp. 383-388. http://geodesic.mathdoc.fr/item/ND_2023_19_3_a6/

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