1. Al-Samarai, R., Haftirman, A., Ahmad, K.R., Al-Douri, Y.: Int. J. Sci. Res. Pub. 2(3), 1–4 (2012)
2. Avitzur, B.: Metal Forming: Process and Analysis. McGraw-Hill Book Company, New York (1968)
3. Backofen, W.A.: Deformation Processing, p. 135. Addison-Wesley Publishing Company, Inc., Reading, Mass (1972)
4. Bishop, J.F.W.: On the effect of friction and compression indentation between flat dies. J. Mech. Phys. Solids 6, 132–144 (1958)
5. Bonnet, C., Valiorgue, F., Rech, J., Claudin, C.: Int. J. Mach. Tool Manuf. 48, 1211–1223 (2008)