1. Gigawatts - the measure of things to come;Hirshman;Photon International,2007
2. Greenpeace and EPIA. Solar Generation IV 2007 - solar electricity for over one billion people and two million jobs by 2020, 2007.
3. European photovoltaic Technology Platform. A strategic research agenda for photovoltaic solar energy technology, 2007; ISBN 978-92-79-05523-2, www.eupvplatform.org
4. Alsema EA, de Wild-scholten MJ. Reduction of the environmental impacts in crystalline silicon module manufacturing, Proceedings of the 22nd European Photovoltaic Solar Energy Conference and Exhibition, Milan, 829-836, 2007.
5. Photovoltaics energy payback times, greenhouse gas emissions and external costs: 2004-early 2005 status;Fthenakis;Progress in Photovoltaics: Research and Applications,2006