1. 3) E. SCHÜRMAN, H. T. BRANDI, E. FLÄCHSENHAAR and W. ALTPETER : Stahl Eisen, 88 (1968), p. 665
2. 5) O. KUBASCHEWSKI and C. B. ALCOCK : Metallurgical Thermochemistry International Series on Material Science and Technology, 5th ed., 24 (1983), p. 294
3. 6) A. RIST and N. MEYSSON : J. Met., 19(1967) 4, p. 50
4. 7) C. STAIB and J. MICHARD : J. Met., 17 (1965) 1, p. 33