1. Sloman, H. A., J. Inst. Metals, 49, 365 (1932).
2. Kroll, W., Metallwirtschaft, 13, 725 (1934); Metal Indust., 47, 29 (1935); Metals and Alloys, 8, 349 (1937). Kaufmann, A. R., Gordon, P., and Lillie, D. W., Trans. Amer. Soc. Metals, 42, 785 (1950).
3. Kerr, I. S., and Wilman, H., J. Inst. Metals, 84, 379 (1955–56). Kerr, I. S., Acta Cryst., 9, 879 (1956).
4. Mott, B. W., and Haines, H. R., J. Inst. Metals, 80, 629 (1951–52).