1. 1) M. Saginuma and T. Watanabe: Daigaku-Kyozai Tekko-Kogaku ZairyoHen Hyomenshori-Kohan, JFE 21st Century Foundation, Tokyo, (2008), 227 (in Japanese).
2. 2) J. Inagaki, M. Sakurai and T. Watanabe: Tetsu-to-Hagané, 79 (1993), 1273.
3. 3) Y. Suzuki, Y. Fushiwaki, Y. Tobiyama and C. Kato: CAMP-ISIJ, 18 (2005), 1501.
4. 4) Y. Tobiyama: Doctoral thesis, Tokyo Institute of Technology, (2015).
5. 5) Y. Tobiyama and C. Kato: Tetsu-to-Hagané, 89 (2003), 38.