1. Amin, M., Tsao, H.S. and Ang, A.H., 1969. Significance of nonstationarity of earthquake motions. Proc. 4th WCEE, Santiago, pp. 97–113.
2. Influencia del amortiguamiento sobre de la respuesta de estructuras sometidas a temblor;Arias;Rev. IDIEM,1962
3. Barstein, M.F., 1960. Application of probability methods for the design against the effect of seismic forces on engineering structures. Proc. 2nd WCEE, Tokyo.
4. Seismic response spectra for equipment design in nuclear power plants;Biggs;Proc. 1st Int. Conf. Struct. Mech. in Reactor Technology, Berlin,1972
5. Seismic response of buildings designed by code for different earthquake intensities;Biggs;M.I.T. Dep. Civ. Eng., Res. Rep.,1973