1. 1) T. Altan:塑性と加工,23(1982),253,113.
2. 2) 山田富重,清野次郎:塑性と加工,23(1982),261,997.
3. 3) T. Hirai, T. Katayama and J. B. Hawkyard,: Proc. Int. Mach. Tool Des. Res. Conf., 26 (1986), 433.
4. 4) O. C. Vardan, A. Bagchi and T. Altan,: Manuf. Technol. Rev., (1987), 386.
5. 5) E. Doege, P. Groche and T. Bobke: Advd Technol. of Plastisity (Japan), 1 (1990), 27.