1. International Energy Agency, Key World Energy Statistics 2000. 19 February 2000 [htttp://www.iea.org/statist/keyworld/keystats.htm].
2. The world PV market : Shifting from subsidy to ‘fully economic’?;Maycock;Renewable Energy World,2000
3. Photovoltaics in buildings: a design handbook for architects and engineers,1996
4. Aulich HA, Schulze FW, Strake B. Energy pay-back time for crystalline silicon photovoltaic modules using new technologies. In: Proceedings of 18th IEEE PV Specialists Conference. The Institute of Electrical and Electronics Engineers; 1985. p. 1213-1218.
5. Hidden energy in solar cells and photovoltaic power stations;Hagedorn,1989