1. E. Kula and M. Cohen:Trans. AIME, 1954, vol. 46, p. 727.
2. D. Webster and G. B. Allen:J. Iron Steel Inst., 1962, vol. 200, p. 520
3. R. A. Grange:Met. Trans., 1971, vol. 2, p. 65.
4. M. S. Rashid:Automotive Engineering Congress, Rep. No. 760206, Detroit, Soc. Auto. Engineers, 1976.
5. R. G. Davies:Met. Trans. A, 1978, vol. 9A, p. 41.