1. Modal analysis of non-classically damped linear systems;Veletsos;Earthquake Engng Struct. Dynam.,1986
2. Solution methods for damped linear systems;Chen;University of California, Berkeley, UCB/SEMM Rep. 87/08,1987
3. Numerical methods for dynamic analysis;Wilson,1977
4. Dynamics of Structures;Clough,1975
5. An eigensolution strategy for large systems;Wilson;Comput. Struct.,1983