MathSciNet bibliographic data MR1662926 (99m:58150) 58F21 (34C05) Shcherbakov, A. A.; Rosales-González, E.; Ortiz-Bobadilla, L. Countable set of limit cycles for the equation \$dw/dz=P\sb n(z,w)/Q\sb n(z,w)\$$dw/dz=P\sb n(z,w)/Q\sb n(z,w)$. J. Dynam. Control Systems 4 (1998), no. 4, 539–581. Article

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