1. Evans, U. R., and Hoar, T. P., Proc. Roy. Soc., A, 137, 343 (1932).
2. Thornhill, R. S., and Evans, U. R., J. Chem. Soc., 614 (1938).
3. Brown, R. H., and Mears, R. B., Trans. Electrochem. Soc., 74, 495 (1938); 81, 455 (1942).
4. Agar, J. N. : see Evans, U. R., J. Iron and Steel Inst., 141, 221P (1940).
5. Rosenfel'd, I. L., First Intern. Congress Met. Corr. 1961, 243 (Butterworths 1962). See also Mayne, J. E. O., Vernon, W. H. J., 251.