1. C. S. Giggins and F. S. Pettit,Trans. Metall. Soc. AIME 245, 2495 (1969).
2. C. S. Giggins and F. S. Pettit,Trans. Metall. Soc. AIME 245, 2509, (1969).
3. B. Chattopadhyay and G. C. Wood,Oxid. Met. 2, 373 (1970).
4. G. C. Wood and B. Chattopadhyay,Corros. Sci. 10, 471 (1971).
5. P. Moulin, F. Armanet, G. Beranger, and P. Lacombe,Mem. Sci. Rev. Met. 143 (1977).