1. 5) M. BAEYERTZ: Trans. ASM, 30 (1942), p.458
2. 6) A. E. NEHRENBERG: Trans. AIME, 188 (1950), p.162
3. 7) E. KULA and M. COHEN: Trans. ASM, 46 (1954), p.727
4. 8) D. WEBSTER and G. B. ALLEN: JISI, 200 (1962), p.520
5. 9) S. S. D'YACHEAKO and G. V. FEDOROV: The Physics of Metals and Metallography, 18 (1964) 1, p.68