9C T Wang,G Kinzel,T Altan.Failure and wrinkle criteria and mathematical modeling of shrink and stretch flanging operations in sheet-metal forming[J].J Mater Proc Technol,1995,53:759-780.
10Xiaoxiang Shi,Jun Chen,Yinghong Peng,Xueyu Ruan,A new approach of die shape optimization for sheet metal forming processes[J].J Mater Proc Technol,2004,152:35-42.