Titlebook: Limit Cycles of Differential Equations; Colin Christopher,Chengzhi Li Textbook 20071st edition Birkhäuser Basel 2007 Abelian integral.Cent

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The Tangential Center-Focus Problemund on the number of limit cycles which can bifurcate from a first-order perturbation of a Hamiltonian system, . where the Hamiltonian, ., is a polynomial of degree . + 1 and the perturbation terms, . and . are polynomials of degree ..