1. Mechanical Vibrations: Theory and Applications;Tse,1978
2. Theory of Vibration with Applications;Thompson,1981
3. Formulas for Natural Frequency and Mode Shape;Blevins,1979
4. Free Vibration Analysis of Beams and Shafts;Gorman,1975
5. Modern Formulas for Statics and Dynamics;Pilkey,1978