Geodesic
On dynamical systems close to Hamiltonian with separatrix loops of a saddle
Sbornik. Mathematics, Tome 83 (1995) no. 1, pp. 79-91 Cet article a éte moissonné depuis la source Math-Net.Ru

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A system of two ordinary autonomous differential equations with a small parameter $\mu$ is considered on the two-dimensional Euclidean plane $R^2$. A condition for the birth of a limit cycle from a separatrix loop of a saddle of a Hamiltonian system is found for $\mu\ne0$. 
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     title = {On dynamical systems close to {Hamiltonian} with separatrix loops of a~saddle},
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V. S. Medvedev; E. L. Fedorov. On dynamical systems close to Hamiltonian with separatrix loops of a saddle. Sbornik. Mathematics, Tome 83 (1995) no. 1, pp. 79-91. http://geodesic.mathdoc.fr/item/SM_1995_83_1_a3/

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