1. A method for the determination of the coefficient of friction of metals under conditions of bulk plastic deformation;Male;J Inst Met,1964
2. Saida Y, Lee CH, Kobayashi S. Some aspects of friction in forging problems. In: Inter-American conference on material and technology, Mexico City; 1970, p. 308.
3. A variational upper-bound method for plane strain problems;Yeh;Trans ASME, J Manufac Sci Eng,1996
4. A variational upper-bound method for analysis of plane strain extrusion test;Yang;J Chin Soc Mech Eng,1997
5. Experimental verification of the vub method using plane strain extrusion tests for 6061 aluminum alloy;Yang;J Mater Proc Manufac Sci,1997