1. Cost optimization of solar heating of buildings in northern regions;Willcutt;ASME Paper No. 75-WA/Sol-9,1975
2. The long-term average performance of flat-plate solar energy collectors;Liu;Solar Energy,1963
3. Luminous and spectral reflectance as well as colors of natural objects;Penndorf,1956
4. A study of the reflection and polarization characteristics of selected natural and artificial surfaces;Bouricius,1965
5. Thermal Environmental Engineering;Threlkeld,1970