1. Comparison of solar concentrators;Rabl;Solar Energy,1976
2. Light collection within the framework of geometrical optics;Winston;J. Opt. Soc. Am.,1970
3. Optics of Nonimaging Concentrators;Welford,1978
4. Long-term average performance of the sunpakTM evacuated-tube collector;Mather,1978
5. Radiant energy transmission. Heat Transmission;Hottell,1954