1. 1) K.Nishioka, S.Yoshida and M.Hariki : Tetsu-to-Hagané, 70 (1984), 358.
2. 2) T.Arima, T.Nishi and T.Okuhara : Tetsu-to-Hagané, 78 (1992), 1101.
3. 3) T.Miyazu, Y.Okuyama, N.Suzuki, T.Fukuyama and T.Mori : Nippon Kokan Tech. Rev.. 67 (1975). 125.
4. 5) K.Shiraishi, T.Yamaguchi, T.Nishi and T.Arima : Coke Circular, 30 (1981), 239.
5. 6) H.E. Blayden, W.Noble and H.L. Riley : J. Iron Steel Inst., 36 (1937), 47.