1. Laves, F., Löhberg, K., and Witte, H., Metallwirtschaft, 14, 793 (1935).
2. “International Tables for the Determination of Crystal Structures” (Gebrüder Borntraeger, Berlin, 1935).
3. Phragmén, G., J. Inst. Met., 77, 489 (1950).
4. Pratt, J. N., and Raynor, G. V., Proc. Roy. Soc., A, 205, 103 (1951).