1. Free Vibration of Elastic Systems;Sekhniashvili,1960
2. Free Vibration Analysis of Beams and Shafts;Gorman,1975
3. Handbook of Free Vibration of Elastic Systems;Ananiev,1946
4. Formulas for Natural Frequency and Mode Shape;Blevins,1979
5. Formulas for Stress, Strain, and Structural Materials;Pilkey,1994