1. C. Wells: Atom Movements (1951) Chapter 2. A.S.M.
2. C. J. Smithells: Metals Reference Book (1949) p. 405. Interscience. Pub. Co.
3. W. Jost: Diffusion (1952) p. 223. Academic Press.
4. A. Fry: Stahl und Eisen (1923) 43, p. 1039.
5. C. Wells and R. F. Mehl: Trans. AIME (1941) 145, p. 315.