1. R. Sugiyama, J. JSTP., 46(534) (2005–7), p. 552.
2. S. Matsuoka et al., JFE Giho (16) (2007–6), p. 16.
3. K. Matsudo et al., Nippon Kokan Giho, 84 (1980), pp. 14–20.
4. K. Seto, Proc. Symposium on Automotive Materials (Tokyo: ISIJ, 2006), pp. 45–52.
5. V.F. Zackay et al., Trans. ASM, 60 (1967), p. 252.