1) Pao, Y. -H.: Elastic waves in solids, J. Appl. Mech., 50th Anniversary Issue, Vol. 50, pp. 1152-1164, 1983.
2) Kobayashi, S. and Nishimura, N.: Transient stress analysis of tunnels and caverns of arbitrary shape due to travelling waves. In: Developments in Boundary Element Methods 2, Applied Science, Barking, pp. 177-210, 1982.
3) Kobayashi, S.: Some problems of the boundary integral equation method in elastodynamics, In: Boundary Elements, Springer, pp. 775-784, 1983.
4) Niwa, Y., Hirose S. and Kitahara, M.: Application of the boundary integral equation (BIE) method to transient response analysis of inclusions in a half space, Wave Motion, Vol. 8, pp. 77-91, 1986.
5) Langenberg, K. J., Brück, D. and Fischer, M.: Inverse scattering algorithms, In: New Procedures in Nondestructive Testing, Springer, Berlin, pp. 381-391, 1983.