Geodesic
Algebraic nonsolvability and almost algebraic solvability of the centerfocus problem
Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 3, pp. 30-37.

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

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