1. R. Foster, and A. Ellis (Jully 2003) Renewable energy for water pumping applications in rural villages, Subcontractor report, period of performance: April 1,2001 _ September 1, 2001.
2. EU financed study in (Energy, Environment and sustainable Development)_Editeur: Systemes solaire-Paris (June 2003) Recommandations pour les installations photovoltaiques de pompages et de potabilisations.
3. H, J. Helikson – University of Florida (USA) Pumping water for irrigation using solar energy.
4. Michael G Thomas, A lbuquerque, NM 87185-0753 Water Pumping: The Solar Alternative, Photovoltaic Systems Design Assistance Centre, Sandia National Laboratories.
5. Robert Kroni, Sandra Stettler and Gabi Friesen, Domenico Chianese (February 2005) Energy Rating of Solar Modules, Final report.