1. C. E. Birchenall and R. F. Mehl: Trans. AIME (1950) 188, pp. 144–149; Journal of Metals (Jan. 1950) TP 2752E.
2. J. Steigman, W. Shockley, and F. C. Nix: Physical Review (1939) 56, p. 13.
3. J. Mazia: Steel (1947) 120, p. 84.
4. R. M. Barrer: Diffusion In and Through Solids. Cambridge. (1941).
5. T. B. Novey and N. Elliott: Plutonium Project Record 9B, 2.2.2.