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3. H. E. Evans, R. Hales, D. A. Hilton, R. A. Holm, G. Knowles, and R. J. Pearce, Proc. BNES Conf. Corr. Steels in CO2, Reading (1974), p. 369.
4. J. M. Silcock, CEGB Report RD/L/N2/75, Leatherhead, U.K. (1975).
5. G. Knowles, CEGB Report RD/B/N3495, Berkeley, U.K. (1975).