1. 1) H. Masumoto, Y. Murakami and N. Nakamura: J. Japan Inst. Metals, 41 (1977), 1014 (in Japanese);
2. H. Masumoto, Y. Murakami and N. Nakamura: Trans. JIM, 19 (1978), 191.
3. 2) Mitoh-Kakoh-Gijutsu-Kyokai Hen: Shinjidai no Jiseizairyo, (in Japanese), Kogyo Chosakai, (1981), p. 97.
4. 3) T. Kawaguchi and H. Yamabe: Metals, 44 (1974), 30 (in Japanese).
5. 4) A. K. Sinha and W. Hume-Rothery: J. Iron Steel Inst., 205 (1967), 671.