WANG D,MAO R.A complex algorithm for computing Lyapunov values[J].Random and Computational Dynamics,1994, 2(3～4):261-277.
[2]
CHAN H S Y,CHUNG K W,LI J.Bifurcations of limit cycles in a Z_3-equivariant planar vector field of degree 5[J].Inter- national Journal of Bifurcation and Chaos,2001,11(8):2287-2298.
[3]
ZHANG W,WANG F X,ZU J W.Local bifurcations and codimension-3 degenerate bifurcations of a quintic nonlinear beam under parametric excitation[J].Chaos,Solitons and Fractals,2005,24(4):977-998.
[4]
LI J,MIAO S F,ZFIANG W.Analysis on bifurcations of multiple limit cycles for a parametrically and externally excited me- chanical system[J].Chaos,Solitons and Fractals,2007,31(4):960-976.
[5]
李静，缪素芬．二维非线性动力系统的多极限环分岔的参数控制[J]．数学杂志，2005，25(6)：695-700．LI Jing,MIAO Su-fen.The parameter control for the multiple limit cycles bifurcation on a two dimension nonlinear mechani- cal system[J].Journal of Mathematics,2005,25(6):695-700.(in Chinese)
[6]
LI J,TIAN Y,ZHANG W,et al.Analysis on bifurcation of multiple limit cycles for a rotor-active magnetic bearings system with time-varying stiffness[J].International Journal of Bifurcation and Chaos,2007,to appear.
[7]
LI J,CHAN H S Y,CHUNG K W.Investigations of bifurcations of limit cycles in Z_2-equivariant planar vector fields of de- gree 5[J].International Journal of Bifurcation and Chaos,2002,12(10):2137-2157.
[8]
LI J,CHAN H S Y,CHUNG K W.Bifurcations of limit cycles in a Z_6-equivariant planar vector field of degree 5[J].Sci- ence in China (Series A),2002,45(7):817-826.
