1. Altan, Taylan, private communication between T. Altan, ERC for Net Shape Manufacturing, Columbus, OH, USA and Mitsubishi Heavy Industries, Japan, 1976.
2. Fundamentals of Machine Component Design;Juvinall,1991
3. Computer-Aided Techniques for the Prediction and Measurement for Die Wear During Hot-Forging of Automotive Exhaust Valves;Painter,1993
4. A Technique to Avoid Failure of Forging Dies;Knoerr,1992
5. Investigation of Die Wear in Upsetting Using FEM Code ALPID;Vardan,1987