1. J. L. Duncan and J. E. Bird:Proceedings of the 10th Biennial Conference of IDDRG, Warwick, England, 1978. See also,Sheet Metal Industries, 1978, vol. 55, p. 1015.
2. M. L. Wenner: “On Workhardening and Springback in Plane Strain Draw Forming,” GMR-3645, General Motors Research Laboratories, Warren, MI, April 1981.
3. H. D. Nine:Mechanics of Sheet Metal Forming, D.P. Koistinen and N.-M. Wang, eds., Plenum Press, New York, NY, 1978, p. 179.
4. H. D. Nine: “The Applicability of Coulomb’s Friction Law to Drawbeads in Sheet Metal Forming,”Journal of Applied Metalworking, July 1982, vol. 2, no. 3, p. 200.
5. H. W. Swift:Engineering, 1948, vol. 166, p. 333 and p. 357.