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2. X. Lucas, Doctor Ingenior thesis, Université de Paris-Sud, Orsay, to be submitted; X. Lucas, E. A. Garcia, G. Beranger, and P. Lacombe,Proceedings of the 6th International Congress on Metallic Corrosion, Sydney (Hudson Lawrence PTY, Ltd., 1975), p. 441.
3. C. Coddet, J. F. Chretien, G. Beranger,C. R. Acad. Sci., Sér. C 282, 815 (1976).
4. J. E. Lopes Gomes, University thesis, Université de Paris-Sud, Orsay (1977).
5. J. E. Lopes Gomes and A. M. Huntz, to appear inOxid. Met.