1. 1) W. J. SLATOSKY : Trans. Metall. Soc. AIME, 221 (1961), p. 118
2. 2) K. KATSURA, K. ISOBE and T. ITAOKA : J. Met., 16 (1964), p. 340
3. 5) H. GRAF : Proc. Intern. Conf. of Autom. on Iron and Steel Making, Luxemburg (1970), C-1
4. 6) H. W. MEYER and J. A. GLASGOW : Blast Furnace and Steel Plant (1966) July, p. 595