1. U. S. Nuclear Regulatory Commission ‘Seismic design classification’, Regulatory Guide 1.29 Rev. 2, February 1976.
2. and , Dynamics of Structures, McGraw Hill, New York, 1975, Chap. 27.
3. Earthquake Engineering, editor, Prentice Hall, Englewood Cliffs, N.J., 1970, Chap. 12.
4. Earthquake response analysis considering non-proportional damping
5. Seismic Design Spectra for Nuclear Power Plants