1. Bifurcation Methods in Polynomial Systems, Bifurcation and Periodic Orbits of Vector Fields;Rousseau,1992
2. Geometrical Methods in the Theory of Ordinary Differential Equations;Arnold,1982
3. Number and location of limit cycles in a class of perturbed polynomial systems;Yang;Acta Math. Appl. Sin. (Engl. Ser.),2004
4. Y.L. Zhao, Abelian integrals for cubic Hamiltonian vector fields, The Doctoral Thesis in Peking University, 1998
5. Averaging analysis of a perturbed quadratic center;Llibre;Nonlinear Anal.,2001