1. World energy outlook,2008
2. Energy storage systems— Characteristics and Comparisons;Ibrahim;Renewable & Sustainable Energy,2008
3. Campen B, Guidi D, Best G. Impact of Solar Photovoltaic systems on rural development, "FAO Study for Rural Electrification in the 21st Century", 17th Latin American Conference on Rural Electrification, Recife, Brazil, 7–11 November 1999.
4. A new look at an old idea;Post;Electromechanical Battery Science and Technology Review,1996
5. Spacecraft energy storage systems;Ginter;NAECON,1997