1. Lovering, J. F., Trans. Amer. Geophys. Union, 39, 947 (1958). See also Birch, F., in Solids Under Pressure, 137, edit. by Paul, W., and Warachauer, D. M. (McGraw-Hill Book Co., 1963).
2. Birch, F., in Contributions in Geophysics in Honor of Beno Gutenberg, 158, edit. by Benioff, H., Ewing, M., Howell, jun., B. F., and Press, F. (Pergamon Press, London, 1958).
3. Fermor, L. L., J. Proc. Asiatic Soc., Bengal, 8, 315 (1912).
4. Hess, H. H., Proc. Roy. Soc., A, 222, 341 (1954).
5. Chaklader, A. C. D., and McKenzie, L. G., Bull. Amer. Ceram. Soc., 43, 892 (1964). Chaklader, A. C. D., Nature, 206, 392 (1965).