Geodesic
The origin of limit cycles under perturbation of the equation $\dfrac{dw}{dz}=-\dfrac{R_z}{R_w}$, where $R(z,w)$ is a polynomial
Sbornik. Mathematics, Tome 7 (1969) no. 3, pp. 353-364 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {Yu. S. Ilyashenko},
     title = {The origin of limit cycles under perturbation of the equation $\dfrac{dw}{dz}=-\dfrac{R_z}{R_w}$, where $R(z,w)$ is a~polynomial},
     journal = {Sbornik. Mathematics},
     pages = {353--364},
     year = {1969},
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}
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Yu. S. Ilyashenko. The origin of limit cycles under perturbation of the equation $\dfrac{dw}{dz}=-\dfrac{R_z}{R_w}$, where $R(z,w)$ is a polynomial. Sbornik. Mathematics, Tome 7 (1969) no. 3, pp. 353-364. http://geodesic.mathdoc.fr/item/SM_1969_7_3_a4/

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