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Saddle point characterization and multiplicity of periodic solutions of non-autonomous second-order systems 期刊论文
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2004, 卷号: 58, 期号: 7-8, 页码: 899-907
作者:  Wu, X
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critical point  non-autonomous second-order systems  Sobolev's inequality