1. 1) Suzuki, T. and Hakuno, M.: Wave propagation analysis by the three dimensional FEM with non-reflecting boundary, Bulettin of Earthquake Research Institute, Univ. of Tokyo, Vol. 59, pp. 327-360, 1984. (in Japanese).
2. 2) Suzuki, T. and Hakuno, M.: 3-D dynamic analysis of ground motion by FEM with non-reflecting boundary, Proc. of JSCE, Structural Eng./Earthquake Eng., Vol. 2, No. 1. pp. 185-193, 1985.
3. 3) Smith, W.: A non-reflecting plane boundary for plane propagation problems, J. Comp. Phys., Vol. 15, pp. 492-503, 1974.
4. 4) Cundall, P. A., Kunar, R. R., Carpenter and Marti, J.: Solution of infinite dynamic problems by finite modelling in the time domain, Proc. 2nd Int. Conf. Appl. Num. modelling, madrid, Spain, 1978.