1. B. Irving:Weld. J., 1991, vol. 70 (9), pp. 39–45.
2. K. Azuma, K. Ikemoto, K. Arima, H. Sugiura, and T. Takasago:Sheet Metals in Forming Processes—Proc. 16th Biennial Congr., ASM INTERNATIONAL, Metals Park, OH, 1988, pp. 205–15.
3. N. Nakagawa, S. Ikura, and F. Natsumi: SAE Paper No. 930522, Society of Automotive Engineers, Warrendale, PA, 1993.
4. N. Iwata , M. Matsui, N. Nakagawa, and S. Ikura:NUMISHEET '93,Proc. 2nd Int. Conf. Numerical Simulation 3-D Sheet Metal Forming Processes, A. Makinouchi, E. Nakamachi, E. Onate, and R.H. Wagoner, eds., 1993, pp. 303-12.
5. K.M. Radlmayr and J. Szinyur:Proc. IDDRG Working Groups Meeting, Association of Italian Metallurgy, Milano, 1991, vol. 2.