1. R. Vogel and W. Tonn:Arch. Eisenhüttenw., 1930, vol. 3, pp. 769–80.
2. G. G. Urazov and N. A. Filin:Metallurg., 1938, vol. 13, pp. 3–17.
3. V. A. Vanyukov, A. V. Vanyukov, and N. T. Taraschuk:Tsvetyne Metally, 1955, vol. 28, no. 4, pp. 23–27.
4. G. Kullerud:Carnegie Institution of Washington Geophysical Laboratory Yearbook 62, pp. 175–89, 1963.
5. S. F. Vaisburd, T. F. Remen', and A. B. Sheinin:Russ. J. Phys. Chem., 1969, vol. 43, pp. 1780–81.