1. Computational Methods in Structural Dynamics;Meirovitch,1980
2. Mechanical Vibration: Analysis and Computation;Newland,1989
3. Coordinates which uncouple the equations of motion of damped linear dynamic system;Foss;Journal of Applied Mechanics,1958
4. Classical normal modes in damped linear dynamic systems;Caughey;Journal of Applied Mechanics,1960
5. Classical normal modes in damped linear dynamic systems;Caughey;Journal of Applied Mechanics,1965