1. Dynamics of Structures;Clough,1995
2. Longitudinal Vibration of Bars;Rao,2007
3. Mathematical Analysis in Engineering: How to Use the Basic Tools;Mei,1997
4. Boundary Elements: Theory and Applications;Katsikadelis,2002
5. Exact longitudinal vibration frequencies of a variable cross-section rod;Eisenberger;Appl. Acoust.,1991