1. For comprehensive accounts see, e.g., Kröger, F. A., The Chemistry of Imperfect Crystals, North Holland Publishing Co., Amsterdam (1964);
2. 1a. Adda, Y., and Philibert, J., La Diffusion dans les Solides, Presses Universitaires de France, Paris (1966);
3. 1b. Flynn, C. P., Point Defects and Diffusion, Clarendon Press, Oxford (1972).
4. See, e.g., Lidiard, A. B., J. Nucl Mat, 19, 106 (1966);
5. 2a. Kröger, F. A., Z. Phys. Chem., 49, 178 (1966);