1. For a more complete treatment see A. S. Nowick, B. S. Berry, Anelastic Relaxation in Crystalline Solids, (Academic Press, New York 1972).
2. For a review of techniques see D. Beshers, Diffusion, ASM, Metals Park, OH, (1973) p. 209.
3. See K. Compaan, Y. Haven, Trans. Faraday Soc, 52 (1956) 786.
4. A. Lidiard, Phil. Mag., 46, (1955) 1218.
5. For example see A. D. LeClaire, J. Nucl. Matl., 69&70 (1978) 70.