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[2] ASM Handbook Committee, Metals Handbook, 4 Forming, ASM Ohio(1969) ,265.
[3] Yoshioka, H., Journal of Japan Society for Technology of Plasticity, 27(1986) ,969.
[4] Yamaguchi, K. et al., ibid., 26(1985) , 1102.
[5] Yamaguchi, K. et al., Proc. 1986 ASME Winter Annual Meeting, Anaheim, PED-20 (1986) , 139.
[6] Yamaguchi, K., Journal of Japan Society for Technology of Plasticity, 24(1983) , 77.
[7] Tozawa, Y. and Ishikawa, T., ibid., 30(1989) ,
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