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2. Singularities and Groups in Bifurcation Theory II;Golubisky,1988
3. Bifurcation and Chaos Theory of Nonlinear Vibration Systems;Chen,1993
4. Bifurcation and Chaos in Engineering;Chen,1998
5. The subharmonic bifurcation solution of nonlinear Mathieu's equation and Euler dynamic buckling problems;Chen;Acta Mech. Sin.,1998