1. Irradiation of Vertical and Horizontal Surfaces by Diffuse Solar Radiation from Cloudless Skies;Parmelee;ASHVE Transaction,1954
2. The Solar Constant;Johnson;Journal of Meteorology,1954
3. Fundamental Pyrheliometry;Drummond;The Sun at Work,1958
4. Caleulation of Solar Radiation and the Solar Heat Load on Man;Klein;Journal of Meteorology,1948
5. The Brightness of the Sky;Moore;Smithsonian Miscellaneous Collection,1920