1. P. Gordon and R. A. Vandermeer:Recrystallization, Grain Growth and Textures, p. 205. ASM, Metals Park, Ohio, 1965.
2. J. B. Clark:High-Temperature High Resolution Metallography, p. 347, Gordon and Breach, New York, 1965.
3. J. H. Westbrook:Met. Rev., 1964, vol. 9, p. 415.
4. E. O. Hall:Proc. Phys. Soc. London, 1951, vol. B64, p. 747.
5. J. R. Low, Jr.:Fracture, p. 68, John Wiley and Sons, New York, 1959.