1. Simple electo-optically controlled dual-axis sun tracker;Lynch;Sol Energy,1990
2. Two-stage electrical array reconfiguration controller for PV-powered water pump;Salameh;Sol Energy,1990
3. Step-up maximum power point tracker for photovoltaic arrays;Salameh;Sol Energy,1990
4. http://en.wikipedia.org/wiki/P-n_junction.
5. *http://en.wikipedia.org/wiki/File:Solar_Spectrum.png; [accessed 10.01.12].