1. H. Wentrup and G. Hieber:Tech. Mitt. Krupp A, Forschungsbechte, 1939, vol. 2, pp. 47–53.
2. R. L. Hadley and G. Derge:AIME Trans., 1955, vol. 203, pp. 55–60.
3. H. Chino, Y. Nakamura, E. Tsunetomi, and K. Segawa:Trans. ISI Japan, 1966, vol. 6, pp. 959–66.
4. J. Chipman:Trans. TMS-AIME, 1960, vol. 218, pp. 767–68.
5. N. A. Gokcen and J. Chipman:AIME Trans., 1953, vol. 197, pp. 173–78.