1. 1) A. Gosh and T. B. King: Trans. Met. Soc. AIME, 246 (1969), 145.
2. 2) T. Hirai, Y. Miura and K. Takahashi: Denki Kagaku, 40 (1972), 138.
3. 3) M. Ashizuka and K. Ôe: J. Japan Inst. Metals, 39 (1975), 388.
4. 4) W. Kagohashi and K. S. Goto: Iron & Steel, 59 (1973), 63.
5. 5) T. Emi: Physical Chemistry Series Vol. 2 Electrochemistry, Ed. by J. O’M Bockris Butterworth, (1976), p. 277-332.