1. 1) K.Yamaguchi, T.Uno, T.Yamamoto, H.Ueno, N.Konno and S.Matsuzaki : Tetsu-to-Hagané, 82 (1996), 641.
2. 2) T.Ariyama, M.Sato, T.Sato, S.Watakabe, and R.Murai : Tetsu-to-Hagané, 92 (2006), 114.
3. 3) H.Jo and S.Ida : Tetsu-to-Hagané, 42 (1956), 226.
4. 4) M.Yokomizo, M.Fukunaga, Y.Nakagawa and T.Iguchi : Proc. of 6th Int. Iron and Steel Cong., ISIJ, Tokyo, (1990), 274.
5. 5) Y.Nakashima, S.Mochizuki, S.Ito, K.Nakagawa, K.Nishimoto and K.Kobayashi : Proc. of 2nd Int. Cokemaking Cong., TIM., London, (1992), 518.