1. California Institute of Technology. Basic research needs for solar energy utilization. Report of the basic energy sciences workshop on solar energy utilization; April 18–21, 2005.
2. Solar electricity;Markvart,1996
3. Khlaichom P, Sonthipermpoon K. Optimization of solar tracking system based on genetic algorithms; 2006. http://www.thaiscience.info/.
4. calculating the position of the sun;Walraven;Solar Energy,1977
5. Poulek V, Libra M. New bifacial solar trackers and tracking concentrators; 2007. http://www. solar-trackers.com.