Geodesic
On the Analytic Solvability of the Problem of Distinguishing between Center and Focus
Informatics and Automation, Nonlinear analytic differential equations, Tome 254 (2006), pp. 11-100

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

The analytic solvability of the problem of distinguishing between a center and a focus is proved in each of semialgebraic subsets whose union is the entire set of monodromic germs. 
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     author = {N. B. Medvedeva},
     title = {On the {Analytic} {Solvability} of the {Problem} of {Distinguishing} between {Center} and {Focus}},
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     year = {2006},
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     url = {http://geodesic.mathdoc.fr/item/TRSPY_2006_254_a1/}
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N. B. Medvedeva. On the Analytic Solvability of the Problem of Distinguishing between Center and Focus. Informatics and Automation, Nonlinear analytic differential equations, Tome 254 (2006), pp. 11-100. http://geodesic.mathdoc.fr/item/TRSPY_2006_254_a1/