1. GWEC. Global wind report – annual market update 2013. Brussels, Belgium: Global Wind Energy Council; 2013.
2. UpWind. Design limits and solutions for very large wind turbines. Brussels, Belgium: European Wind Energy Association; 2011.
3. PNNL, Pacific Northwest National Laboratory. 2012 Market Report on U.S. Wind Technologies in Distributed Applications. Washington: U.S. Department of Energy; 2013.
4. AWEA. Small wind turbine global market study. Washington: American Wind Energy Association; 2010.
5. Evaluation of different turbine concepts for wind power;Eriksson;Renew Sustain Energy Rev,2008