1. 1) Constantopoulos, I. V., Roesset, J. M. and Christian, J. T. (1973) : “A comparison of linear and exact nonlinear analyses of soil amplification, ” Proc. 5th Int. Conf. on SMFE, Rome, pp. 1806-1815.
2. 2) Idriss, I. M. (1990) : “Response of soft soil sites during earthquakes, ” Proc. H. Bolton Seed Memorial Symp., pp. 273-290.
3. 3) Idriss, I. M., Fiegel, G. L., Kutter, B. L. and Li, X. S. (1993) : “Ground response studies using the centrifuge, ” Summary Progress Report presented at US-Japan Workshop, Napa, California.
4. 4) Kokusho, T. and Iwatate, K. (1979) : “Scaled model tests and numerical analyses on nonlinear dynamic response of soft grounds, ” J. of Japan Society for Civil Engineers No. 285, pp. 57-67 (in Japanese).
5. 5) Kokusho, T. (1980) : “Cyclic triaxial test of dynamic soil properties for wide strain range, ” Soils and Foundations, Vol. 20, No. 2, pp. 45-60.