1. An analysis of response of a damped dynamical system subjected to impressed forces;Traill-Nash;Aeronautical Research Laboratories Report SM 151,1950
2. Co-ordinates which uncouple the equations of motion of damped linear dynamic systems;Foss;Transactions of the American Society of Mechanical Engineers, Journal of Applied Mechanics,1958
3. Elementary Matrices;Frazer,1960
4. Dynamics of Structures;Hurty,1964
5. Analytical Methods in Vibrations;Meirovitch,1967