1. S. Floreen and R. Decker, Trans. Am. Soc. Met.,55, No. 3 (1962).
2. M. D. Perkas and V. I. Snitsar', Fiz. Metal. i Metalloved.,17, No. 3 (1964).
3. N. Bush, Trans. Am. Soc. Met.,56, No. 4 (1963).
4. E. Kula and E. Hickey, Trans. AIME,230, No. 7 (1964).
5. J. Livingston and J. Becker, Trans. AIME,212 (1958).