1. K. Hashimoto, T. Ohwue and M. Takita,Proc. 16th Biennial Cong. IDDRG (ed., Yngve Bergström), p. 153, Borlange (1990).
2. Y. S. Kim and W. J. Choi,J. Mater. Prvc. Tech. 36, 187 (1993).
3. V. Rangarajan,PhD thesis, Colorado School of Mines, Golden, Colorado (1989).
4. S. P. Keeler and T. E. Dwyer,SAE technical paper, No. 860433 (1986).
5. Y. S. Kim, J. B. Nam and W. J. Choi,J. Korea Soc. Mech. Eng. 14-6, 1474 (1990).