1. 1) E. L. Kennyon: Symposium on Industrial Metallurgy, ASM, Cleveland, Ohio, (1949), p. 153.
2. 2) ASTM designation E 112-60 T.
3. 3) H. Burghoff: Symposium on Industrial Metallurgy, ASM, Cleveland, Ohio, (1949), p. 160.
4. 4) J. E. Hilliard: Metal Progress, 85, No. 5 (1964), 99.
5. 5) C. S. Smith and L. G. Guttman: Trans. Met. Soc. AIME, 218 (1953), 81.