1. G. Herbsieb and R. K. Poepperling: NACE Annual Meeting, Corrosion/ 80, Paper 13, Chicago, IL, 1980.
2. S. O. Bernhardsson, J. Oredsson and M. Tynell:ibid., Paper 14.
3. A. I. Asphahani:ibid., Paper 12.
4. J. Kolts: NACE Annual Meeting, Corrosion/82, Paper 241, Houston, TX, 1982.
5. Nippon Kokan K. K., unpublished research.