References
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- Henn, R. W., Photogr. Sei. Tech., 18B, 51 (1952), ibid. p. 90 and 19B, 131 (1953).
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- Levenson, G. 1. P., J. Photogr. Sci., 24, 68 (1976).
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- Pontius, R. B. and Willis, R. G, Photogr. Sci. Eng., 17, 21 (1973), ibid. pp. 157 and 326.
- Levenson, G. 1. P. and Tabor, J. H, Science et Ind. Photogr., (2) 23, 295 (1952).
- Unpublished work by GIPL.
- Karrer, J. and Berg, W. F., J. Photogr. Sci., 19, 143 (1971).