1. Dynamics of Rotating Systems;Genta,2005
2. The concept of complex damping;Myklestadt;Journal of Applied Mechanics,1952
3. The role of damping in vibration theory;Crandall;Journal of Sound and Vibration,1970
4. Vibration Dynamics and Control;Genta,2008
5. Rotordynamics;Crandall,1995