Geodesic
Algebraic nonsolvability and almost algebraic solvability of the centerfocus problem
Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 3, pp. 30-37 
Yu. S. Ilyashenko. Algebraic nonsolvability and almost algebraic solvability of the centerfocus problem. Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 3, pp. 30-37. http://geodesic.mathdoc.fr/item/FAA_1972_6_3_a4/
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     title = {Algebraic nonsolvability and almost algebraic solvability of the centerfocus problem},
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     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_3_a4/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[2] Arnold V.I., “O lokalnykh zadachakh analiza”, Vestnik MGU, seriya matem., 2 (1970), 52–56 | MR

[3] Petrovskii I.G., Landis E.M., “O chisle predelnykh tsiklov uravneniya $\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$, gde $P$ i $Q$ – mnogochleny vtoroi stepeni”, Matem. sb., 37:2 (1955), 209–250 | MR

[4] Ilyashenko Yu.S., “Vozniknovenie predelnykh tsiklov pri vozmuschenii uravneniya $\frac{dw}{dz}=-\frac{R_z}{R_w}$, gde $R(z,w)$ – mnogochlen”, Matem. sb., 78 (1969), 360–373