1. 2) W. KLUFT, W. KONIG, C. A. van LUTTERVELT, K. NAKAYAMA and A. J. PEKELHARIG : Annals CIRP, 28 (1979), p. 441
2. 4) E. MIYOSHI, M. TAKETA, N. KAMIKI, E. TAMURA and T. KATO : The Sumitomo Search (1970) 5, p. 110
3. 5) D. J. NAYLOR, D. T. LLEWELLYN and D. M. KEANE : Met. Technol., 3 (1976), p. 254
4. 8) K. G. LEWIS : Iron and Steel (1958) April, p. 133
5. 11) D. BHATTACHARYA : 22nd Mechanical Working & Steel Processing Conf. (1980) [ISS-AIME]