1. The Optimum Seasonal and Yearly Tilt Angle for South-facing Solar Collectors;El-kassaby,1987
2. Performance of flat-plate solar energy collectors;Hottel,1954
3. Operating experience with solar water heating;Heywood;J. Inst. Heat Vent. Engng,1971
4. Utilization of Sun and Sky Radiation for Heating and Cooling of Buildings;Yellott;ASHRAE,1973
5. Optimum tilt of a solar collector;Lewis;Sol. Wind Technol.,1987