1. Solar energy technology applications in the Sudan;Omer,1995
2. Solar Engineering of Thermal Process;Duffie,1980
3. Solar radiation and measurement;Kirtikara,1983
4. Meteorological aspects of the utilization of solar energy as an energy source;World Meteorological Organization,1981
5. A comparison of some simple models to predict irradiance on a horizontal surface;Goldberg;Solar Energy,1979