6C Weidemann. The blankholder action of drawbeads,Proceedings of 10th biennial IDDRG congress, 1978,79-85
7N M Wang. A mathematical model of drawbead forces in sheet metal forming, Journal of applied metalworking, 1982, 2 (3): 193-199
8B S Levy. Development of a predictive model for drawbead restraining force utilizing work of Nine and Wang, Journal of applied metalworking, 1983, 3(1): 38-44
9T B Stoughton. Model of drawbead forces in sheet metal forming, Proceedings of 15th biennial IDDRG congress, 1988, (5): 205-215
10S Kluge. Spannungsuberlagerung durch einsatz vonzichstaben beim umformen unregelmabiger blehteile, Blech rohre profile 39, 1992, 117-123