1. H. Strabe, G. Kuhnelt, and E. Plöckinger:Arch. Eisenhüttenw., 1967, vol. 38, no. 7, p. 509.
2. H. Sawamura and K. Sand: Special Report No. 3, 1963, The Subcommittee for Physical Chemistry of Steelmaking, The Japan Society for the Promotion of Science, Tokyo.
3. A. Muan and E. F. Osborn:Phase Equilibria Among Oxides in Steelmaking, p. 53, Addison-Wesley Publishing Co., 1965.
4. A. McLean:J. Metals, 1968, vol. 20, no. 3, p. 96.
5. C. E. Sims, ed.,Electric Furnace Steelmaking, Interscience Publishers, 1962, Ch. 16, Fig. 16.