1. Elements of Vibration Analysis;Meirovitch,1986
2. Inverse Problems in Vibration;Gladwell,1986
3. A vibrational technique for non-destructively assesing the integrity of sructures;Adams;J. mech. Engng Sci,1978
4. Vibration of cracked shafts in bending;Dymarogonas;J. of Sound and Vibration,1983
5. A compaparison of the natural frequency changes pruduced by crackes ans slots;Cawley;Transactions of the ASME,1988