1. Fontana, M.G. and Greene, N.D., Corrosion Engineering; McGraw-Hill, N.Y., p. 50 (1967).
2. Greene, N.D. and Fontana, M.G., Corrosion, Vol. 15, 25t, (1959).
3. Fontana, M.G. and Greene, N.D., op. cit., p. 57.
4. Espy, H.L., Metal Progress, p. 109–115, (Sept. 1964).
5. Shirley, H.T., Corrosion, edited by L.L. Schreir, Wiley and Sons, p. 3.62 (1963).