1. 1) J. Sawamura, K. Itou, N. Uno and M. Oomizu: Tetsu-to-Hagané, 61 (1975), S416.
2. 2) R. Nakajima, S. Komatsu, M. Shimizu, H. Inoue and A. Takagi: Tetsu-to-Hagané, 61 (1987), S765.
3. 3) For example, S. Funada and T. Saito: Tetsu-to-Hagané, 43 (1957), 880.
4. 4) T. Kawaguchi, K. Kuriyama, S. Sato and K. Takada: Tetsu-to-Hagané, 76 (1990), 1642.
5. 5) T. Haga, A. Ohshio, Y. Hida, H. Fukuda and N. Ogata: Tetsu-to-Hagané, 83 (1997), 233.