1. G. Grube, H.V. Zeppelin, and H. Bumm:Z. Elektrochem., 1934, vol. 40, pp. 160–64.
2. O.H. Henry and H.V. Cordiano:Trans. TMS-AIME, 1934, vol. 111, pp. 319–32.
3. P. Saldau and F. Schamray:Z. Anorg. Chem., 1935, vol. 224, pp. 388–98.
4. W.E. Freeth and G.V. Raynor:J. Inst. Met, 1953-54, vol. 82, pp. 575–80.
5. E. Schurmann and HJ. Voss:Giessereiforschung, 1981, vol. 33, pp. 35–38.