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[13] Hong-mei Kang , Yuansheng Wang, Linhong Xu . Simulation Study in Warm Extruding Punch of Drilling Bit Shell. Faculty of Mechanical & Electronical Information China Univerisity of Geosciences Wuhan China 2007．
[14] F.-K. Chen and Y.-C. LiaoAn Analysis of Draw-Wall Wrinkling in a Stamping Die Design
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 2012.