1. R. Wasmuht, Arch. Eisenh�ttenw. 5 (1931) 45.
2. J. P. Henon, C. Wache and J. Manenc, Mem. Sci. Rev. Met. 63 (1966) 99.
3. D. J. Abson, G. G. Brown and J. A. Whiteman, J. Austr. Inst. Metals 13 (1968) 61.
4. D. H. Jack, Met. Sci. J. 4 (1970) 22.
5. D. H. Jack and F. Guiu, ?Proceedings of the 2nd International Conference on Strength of Metals and Alloys? (A.S.M., Cleveland, Ohio, 1970) p. 606.