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【摘 要】
：
By taking infinite periodic beams as examples,the mutual variational principle for analyzing thefree wave propagation in periodic structures is established and
【机 构】
：
BeijingUniversityofAeronauticsandAstronautics
【出 处】
：
力学学报：英文版
【发表日期】
：
1993年2期
【基金项目】
：
Supported by Doctorate Training Fund of National Education Commission of China
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