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2. R. Hill, The Mathematical Theory of Plasticity, Oxford, 1950
3. H. Lippmann, Mechanik des plastischen Fließen, Springer-Verlag, 1981
4. W. Johnson and H. Kudo, The Mechanics of Metal Extrusion, Manchester University Press, 1962
5. W. Johnson, R. Soverby and I. B. Haddow, Plane Strain Slip Line Fields; Theory and Bibliography, E. Arnold Ltd, London, 1970