1. A. K. Chopra, Dynamics of Structures: Theory and Applications to Earthquake Engineering, 4th Edition, Prentice Hall, Englewood Cliffs, New Jersey, 2012.
2. Lanczos Algorithm for the Quadratic Eigenvalue Problem in Engineering Applications;Rajakumar;International Jornal of Numerical Methods in Engineering,1993
3. Eigensolution of nonclassically damped structures by complex subspace iteration;Fischer;Computer Methods in Applied Mechanics and Engineering,2000
4. Simple numerical algorithms for the mode superposition analysis of linear structural systems with non-proportional damping;Ibrahimbegovic;Computers and Structures,1989
5. Iterative methods for non-classically damped dynamic system;Udwadia;Earthquake Engineering and Structural Dynamics,1994