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Hopf bifurcation for a class of three-dimensional nonlinear dynamic systems[J] . Qinlong Wang,Yirong Liu,Chen Haibo. Bulletin des sciences mathematiques . 2009 (7)
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A cubic system with twelve small amplitude limit cycles[J] . Yirong Liu,Wentao Huang. Bulletin des sciences mathematiques . 2004 (2)
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Center conditions and bifurcation of limit cycles at degenerate singular points in a quintic polynomial differential system[J] . Haibo Chen,Yirong Liu,Xianwu Zeng. Bulletin des sciences mathematiques . 2004 (2)
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A polynomial differential system withnine limit cycles at infinity[J] . Wentao Huang,Yirong Liu. Computers and Mathematics with Applications . 2004 (3)
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Theory of center-focus for a class of higher-degree critical points and infinite points
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SCIENCE IN CHINA SERIES A-MATHEMATICS,
2001, 44 (03)
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