1. U. R. Evans, J. Iron and Steel Inst., Vol. 141, 219 (1940).
2. R. S. Thornhill and U. R. Evans, J. Chem. Soc., Vol. 2109 (1938).
3. U. R. Evans and J. N. Agar, in “The Corrosion and Oxidation of Metals”, (eds. U. R. Evans), Edward Arnold, London (1960),
4. W. Jaenicke, Z. Phys. Chim., Vol. A191, 350 (1943).
5. W. Jaenicke and K. F. Bonhoeffer, Z. Physik. Chim., Vol. 193, 301 (1944).