1. 1) F. P. GLASSER : J. Am. Ceram. Soc., 45 (1962), p. 242
2. 2) K. P. ABRAHAM, M. W. DAVIES and F. D. RICHARDSON : J. Iron Steel Inst., 196 (1960), p. 82
3. 4) A. MUAN and E. F. OSBORN : Phase equilibria among oxides in steelmaking (1965), p. 86 [Addison-Wesley Publishing Company]
4. 5) N. TIBERG and A. MUAN : Metall. Trans., 1 (1970), p. 435
5. 6) E. T. TURKDOGAN : Physical Chemistry of High Temperature Technology (1980), p. 5 [Academic Press]