1. A. H. Durose and D. M. Hutchison, Plating (May) (1953) 470.
2. A. K. Graham and H. L. Pinkerton, ibid. (April) (1965) 309.
3. B. F. Rothschild and D. Sanders, ibid. (December) (1969) 1363.
4. J. P. Langon, Plating Surf. Finish. (January) (1983) 21.
5. J. B. Mohler, Iron Age (February) (1952) 139.