References
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- Breneman E. J. Phot. Sci. Eng. 1, 74 (1957).
- Scofield. F., Judd, D. B. and Hunter. R S. ASTM Bull. 110 19-24 (1941).
- Hunter R. S. J. Opt. Soc. Am. 32. pp 538 (1942).