1. E. Orowan:Rep. Progr. Phys., 1948-49, vol. 12, pp. 185–232.
2. O. Mohr:Abhandlungen ans dem Gebiete der technischen Mechanik, 2nd ed., Berlin, 1914, referenced inPlasticity, by Nadai and Wahl, p. 59, McGraw Hill, New York, 1931.
3. J. Marin:Mechanical Behavior of Engineering Materials, p. 126, Prentice Hall, London, 1963.
4. V. Weiss:Proceedings of The International Conference on Mechanical Behavior of Materials, p. 458, Kyoto, Japan, 1971.
5. M. G. Cockcroft:Ductility, p. 208, ASM, Metals Park, OH, 1968.