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2. Metal Forming: Fundamentals and Applications;Altan,1983
3. Investigation of metal flow and lubrication in isothermal precision forging of aluminum alloys;Kropp,1988
4. A friction test for extrusion based on combined forward and backward flow;Sanchez,1985
5. A friction test for extrusion using combined flow with emphasis on backward extrusion;Popilek,1991