1. USA Standard Z7.1–1967, UDC 653.014. 8: 621. 32, Sponsored by Illuminating Engineering Society, approved by USA Standards Institute, August 1967.
2. J. W. Chamberlain, Physics of the Aurora and Airglow, Academic Press, New York (1961), Appendix II.
3. H. J. Kostkowski, “Spectral Radiance,” NBS TN 262, Accuracy in Measurements and Calibrations, 1965, U.S. Government Printing Office (1965).
4. Ralph Stair, “Spectral Irradiance,” NBS TN 262, Accuracy in Measurements and Calibrations, 1965, U.S. Government Printing Office (1965).
5. A. J. Drummond, “Precision Radiometry and its Significance in Atmospheric and Space Physics,” unpublished lecture notes. These notes may be obtained from the author at Eppley Laboratory, Newport, Rhode Island.