1. On electric effects under the influence of solar radiation;Becquerel;Compt. Rend.,1839
2. A new silicon p-n junction photocell for converting solar radiation into electrical power;Chapin;J. Appl. Phys.,1954
3. F. Daniels “A limitless resource: Solar energy,” The New York Times , March 18, 1956
4. Photon Consulting, Oct. 2012