1. Bath M.,Introduction to seismology (John Wiley, New York, 1973).
2. Cagniard, L.,Reflection and Refraction of Progressive Seismic Wave, Translated by Flinn and Dix (McGraw-Hill Book Co., New York, 1962).
3. Chao, C. C. (1960), J. Appl. Mech. E.27, 559?567.
4. Eason, G. (1966), J. Inst. Math. Applic.2, 299?326.
5. Gakenheimer, D. C. andMiklowitz, J. (1969), J. Appl. Mech.36, Ser. E, 505?515.