References
- C. E. PEARSON and R. N. PARKINS: 'The extrusion of metals': 1961, London, Chapman and Hall.
- T. SHEPPARD and A. F. CASTLE: to be published.
- T. SHEPPARD and D. RAYROULD: J. Inst. Metals, 1973, 101, 33.
- H. J. MCQUEEN et al.: Can. J. Phys., 1967, 45, 1225.