1. 1) H. J. Goldschmidt: J. Iron and steel Inst., 160 (1948), 345.
2. 2) G. Brauer, H. Renner and J. Wernet: Z. anorg. allgem. Chem., 277 (1954), 249.
3. 3) R. W. Powers and M. V. Doyle: Trans. AIME, 209 (1957), 1285.
4. 4) R. P. Elliott: Armour Research Foundation Repts., ARF-2120-4 (1959).
5. 5) M. L. Pochon, C. R. McKinsey, R. A. Perkins and W. D. Forgeng: Metallugical Society Conf., vol. 2, “Reactive Metals” p. 327, Interscience Publishers, New York. 1959.