1. Yimin Zhang. Mechanical Vibration [M]. Beijing: Tsinghua University Press, 2007: 115-117 (in Chinese).
2. Lei Zhang, Rigidity and Modal Analysis and Study on Car Body [D]. Anhui: Hefei University of Technology, 2007 (in Chinese).
3. Word Heylen, Stiffen Laments, Paul sas. Modal Analysis Theory and Testing [M]. Beijing, Beijing Institute of Technology Press, (2001).
4. Jiyuan Zhu, Dejian Zhou. Study on Board Level Circuit Module and Its Structure Optimization [J]. Electronics Process Technology, 2008, 29(2): 71-73 (in Chinese).
5. Fangju Dai. Guohui Cheng. PCB Vibration-Proof Design [J]. Communication Countermeasures, 2004(3): 56-58 (in Chinese).