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2. C. Wagner,Z. Elecktrochem. 65 (61) 581.
3. J. M. Silcock,J. Inst. Metals 89 (1960) 203.
4. R. N. Wilson ibid 97 (1969) 80.
5. R. N. Wilson, D. M. Moore andP. J. E. Forsyth,ibid 95 (1967) 177.