国家自然科学基金(50475109)和高等学校博士学科点专项科研基金(20060732002)资助的项目
周伟,褚衍东,俞建宁,李志苹.一类两自由度含间隙系统的Hopf分岔[J].动力学与控制学报,2008,6(3):235~238; Zhou Wei, Chu Yandong, Yu Jianning, Li Zhiping. The Hopf bifurcation of a two-degree-of-freedom system with clearance[J]. Journal of Dynamics and Control,2008,6(3):235-238.
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