1. Probabilistic Theory of Structural Dynamics;Lin,1967
2. Behaviour of structures during earthquakes;Housner,1960
3. Some problems in the application of spectrum techniques to strong motion earthquake analysis;Hudson;Bull. Seismol. Soc. Amer.,1963
4. Damped Fourier spectrum and response spectra;Udwadia;Bull. Seismol. Soc. Amer.,1973
5. Dynamics of Structures;Clough,1975