1. Frequency of Daily Insolation in Anglo North America During June and December;Bennett;Solar Energy,1967
2. J. Werth, in Workshop Proceedings on Photovoltaic Conversion of Solar Energy for Terrestrial Applications, Vol. 1, p. 65, JPL report NSF-RA-N-74-013 under NSF/RANN grant AG-485.
3. Estimated cost of large-scale power generation using solar cells;Spakowski,1972
4. Proc. Intersociety Energy Conversion Engineering Conf. (SAE);Glaser,1971
5. C. G. Currin, private communication.