Evgenii P. Volokitin, "Center conditions for a simple class of quintic systems", International Journal of Mathematics and Mathematical Sciences, vol. 29, Article ID 328964, 8 pages, 2002. https://doi.org/10.1155/S0161171202012802
Center conditions for a simple class of quintic systems
We obtained center conditions for an -symmetric system of degree for which the origin is a uniformly isochronous singular point.
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