1. 1) Y. NAKAMURA, N. TOKUMITSU, K. HARASHIMA, and K. SEGAWA: Trans. ISIJ, 16 (1976), p.623
2. 5) Y. NAKAMURA, N. TOKUMITSU, and K. HARASHIMA: Trans. ISIJ, 14 (194), p.170
3. 7) J. CAMBELL and D.I. DAWSON: BISA Open Report, MG/58/71 (1971)
4. 8) D.C. Ghook and E.G. HESS: Science and Culture, 28 (1962), p.386
5. 9) H. SCHENCK, E. STEINMETZ, and H.G. GITIZAD: Arch. EisenhÜttenw., 40 (1969), p.597