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Статья

On limit cycles of systems with a partial integral

Differential Equations. 2012. Vol. 48. No. 8. P. 1180-1182.
S.A.Chistyakova, Dolov M. V.

For a certain class of two-dimensional autonomous systems of differential equations with an invariant curve that contains ovals, we indicate necessary and sufficient conditions for these ovals to be limit cycles of phase trajectories.