1. Metals Handbook, Vol. 5, 9th Edn (ASM, Metals Park, Ohio, 1961) p. 323.
2. D. R. Gabe, in ?Principles of metal surface treatment and protection?(Pergamon Press, New York, 1972) p. 82.
3. P. G. Shewmon, in ?Diffusion in Solids? (McGraw Hill, New York, 1963) pp. 6, 165.
4. A. H. King, Int. Mater. Rev. 32 (1987) 173.
5. I. Manna, S. K. Pabi and W. Gust, J. Mater. Sci. 26 (1991) 4888.