%0 Journal Article %T Efficient Procedures of Sensitivity Analysis for Structural Vibration Systems with Repeated Frequencies %A Shijia Zhao %A Tao Xu %A Guikai Guo %A Wei Zhang %J Journal of Applied Mathematics %D 2013 %I Hindawi Publishing Corporation %R 10.1155/2013/810147 %U http://dx.doi.org/10.1155/2013/810147