1. The increasing use of aluminum in automotive applications;Brown;JOM,1995
2. S. Kalpakjian. Manufacturing Processes for Engineering Materials, 2nd ed., Illinois Institute of Technology, 1991, pp. 374–376.
3. Simulation of rectangular extruded pipes by porthole die;Murakami;Journal of the JSTP,1997
4. Multi-billet extrusion and load in forming of circular tube from four billets;Murakami;Journal of the JSTP,1990
5. Effects of die angle on pressure distribution at internal surface of die block and extrudability of billet in hot extrusion;Takatsuji;Journal of the JSTP,1988