1. Global Wind Energy Council Report. [Online] Available from: http://www.gwec.net/global-figures/wind-in-numbers/
2. AWEA U.S. Wind Industry Market Reports for 2015 [Online]. Available from: http://www.awea.org
3. Manwell J, Mcgowan J, Rogers A. Wind Energy Explained: Theory, Design, and Applications. Second ed. United Kingdom: Wiley; 2011
4. Ribrant J, Bertling L. Survey of failures in wind power systems with focus on swedish wind power plants during 1997-2005. IEEE Transactions on Energy Conversion. 2007;22(1):167-173
5. Daneshi-Far Z, Capolino GA, Henao H. Review of failures and condition monitoring in wind turbine generators. In: International Conference on Electrical Machines. 2010