References
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- Powell, P. G., and Farnell, G. C. J. Phot. Sci., 10, 340 (1962).
- Farnell, GC. and Powell, P. G. J. Phot. Sci., 10, 261 (1962).
- Spencer. H. E., Brady, L. E, and Hamilton, J. F. Paper presented at the International Colloquium on the Science of Photography, Turin, September 1963.
- Farnell, G. C, Burlon, P. C., and Hallama, R. Phil. Mag., 41, 545 (1950).