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1. 2010, http//baike.baidu.com/view/26994.html?fromT
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5. OU J P,SOONG T T,Recent advance in research on
   applications of passive energy dissipation
   systems. Earthquack Eng,1997,38(3)358-361.
6. 2013, http//baike.baidu.com/view/754590.htm
7. 2013, http//www.alltheweb.com/
8. 2013, http//www.alexa.com/

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