1. H. Brunner andN. J. Grant,Trans. AIME 215 (1959) 48.
2. H. C. Chang andN. J. Grant,J. Metals (May 1956)8,Trans. AIME 206 (1956) 544.
3. Idem, ibid. (February, 1953) 305.
4. I. S. Choi andS. W. Nam, Korea Patent No. 85-1260 (1985).
5. C. J. Smithells, ?Metals Reference Book?, Vol. 1 (Butterworths, London, 1978) p. 301.