1. C.E. Pearson and R.N. Parkins, The Extrusion of Metals, 2nd ed., London, Chapman and Hall, 1960

2. K. Lange and H. Stenger, Extrusion: Process, Machinery, Tooling, American Society for Metals, 1981

3. P. Loewenstein, L.R. Aronin, and A.L. Geary, Powder Metallurgy, W. Leszyski, Ed., Interscience, 1961, p 563-583

4. F.V. Lenel, Powder Metallurgy—Principles and Applications, Metal Powder Industries Federation, 1980

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