1. Mane, P., Ninth Cong. Large Dams, C., 13, 509, Istanbul (1967).
2. Guha, S., Third Symposium Earthq. Eng., Proc., 399, Roorkee (1966).
3. Papazachos, B., Sci. Progress Rep. 8, AF 61(052)–803 (1967).
4. Rothe, J. P., New Scientist, 39, 75 (1968).
5. Schiff, A., and Bogdanoff, J., Bull. Seism. Soc. Amer., 57, 857 (1967).