1. J. P. Larpin, M. Lambertin, J. C. Colson,C. R. Acad. Sci.,285C, 229 (1977).
2. A. Rahmel, J. A. Gonzalez,Werkstoff. Korr. 24, 433 (1973).
3. M. K. E. Loudjani, Thesis, Paris (1980).
4. Proceedings of Spring Residential Conference of the Institution of Metallurgists, Vols. 1 and 2, (1980).
5. P. Dumas, Thesis, Dijon (1979).