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• Haghighat.Heshmatollah Upper Bound Analysis of Tube Extrusion Process Through Rotating Conical Dies with Large Mandrel Radius [ Vol.7, Issue 2 - Spring Year 2015]
• Haghighat.Heshmatollah Analysis of Axisymmetric Extrusion Process through Dies of any Shape with General Shear Boundaries [ Vol.7, Issue 4 - Autumn Year 2015]