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most citedLimit cycles of planar system defined by the sum of two quasi-homogeneous vecter fields

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math.CA2020

A new Chebyshev criterion and its application to planar differential systems

Jianfeng Huang, Haihua Liang, Xiang Zhang

This paper establishes a new Chebyshev criterion for some family of integrals. By virtue of this criterion we obtain several new Chebyshev families. With the help of these new fami…