1. 1) P. BARDENHEUER and W. GELLER : Mitt. Kai. Will. Inst., Eisenforschung, 16 (1934), p. 68
2. 2) K. L. FETTERS and J. CHIPMAN : Trans. AIME, 145 (1941), p. 95
3. 3) T. B. WINKLER and J. CHIPMAN : Trans. AIME, 167 (1946), p. 111
4. 4) N. J. GRANT and J. CHIPMAN : Trans. AIME, 167 (1946), p. 134
5. 5) R. ROCCA, N. J. GRANT, and J. CHIPMAN : Trans. AIME, 191 (1951), p. 319