1. www.ecoworld.com/energy-fuel/wind-power-in-china.html
2. Wind Power Monthly magazine, May 2009, (special report USA)
3. GWEC (Global Wind Energy Council) www.gwec.net
4. Paul Hogg, “Composite materials for wind turbines”, Seminar on Renewable Energies, July 2009, Birmingham, UK.
5. “Renewable Energy Roadmap”, Commission of the European Communities, Brussels, 10 January 2007, COM 2006 848 final.