1. H. Jeffreys, K.E. Bullen, Seismological Tables (Black Bear Press, Cambridge, 1940)
2. T. Lay, in International Handbook of Earthquake and Engineering Seismology, ed. by W. Lee, H. Kanamori, P. Jennings, C. Kisslinger (Elsevier, Amsterdam, 2002)
3. F. Stacey, Physics of the Earth (Wiley, New York, 1969)
4. D. Anderson, in Latest information from Seismic Observations, ed. by T. Gaskell (Academic Press, New York, 1967)
5. M. Toksöz, M. Chinnery, D. Anderson, Geophys. J. R. Astron. Soc. 13, 31 (1967)