1. Robert L, Hirsch R, Bezdek R and Wedling R. Peaking of world oil production: impacts, mitigation, and risk management; 2005
2. Global challenges in energy;Dorian;Energy Policy,2006
3. Global solar radiation estimation from relative sunshine hours in Yemen;Jamil;Renew Energy,1993
4. A review of renewable energy activities in Yemen;Bin Gadhi;Renew Energy,1998
5. Monthly design values for solar energy collectors and concentrators systems in Yemen;Almakaleh;J Sci Technol,1999