1. 2) Proc. of Int. Symp. on Ultrafine Grained Steels (ISUGS 2001), ed. by S. Takaki and T. Maki, ISIJ, Tokyo, (2001).
2. 3) S. Torizuka, O. Umezawa, K. Nagai, K. Tsuzaki, S. Genda and Y. Kogo: Proc. of Int. Conf. on Solid-Solid Phase Transformation '99, ed. by M. Koiwa, K. Otsuka and T. Miyazaki, JIM, Sendai, (1999), 1533.
3. 4) S. Nanba, M. Nomura, N. Matsukura and K. Makii: Proc. of 4th Symp. on Super Metal, JRCM&RIMCOF, Tokyo, (2001), 115.