1. Bald W, Beisemann G, Feldmann H, et al: Iron and Steel Engineer Vol. 64(1987) No. 3, p.32.
2. Chen Xianlin: Journal of University of Science and Technology Beijing Vol. 19 (1997) No. S2, p.1. (In Chinese).
3. Klamma K: Metallurgical Plant and Technology Vol. 8 (1985) No. 3, p.60.
4. Yasuda K, Narita K, Kobayashi K, et al: ISIJ International Vol. 31 (1991) No. 6, p.594.
5. Nakajima H, Kikuma T, Kajiwara T, et al: Hitachi Review Vol. 28 (1979) No. 5, p.223.