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2. Global Eind Energy Council (GWEC) (2014)
3. 2014 JRC wind status report (2014)
4. Clark, D.: Cube Special Report: Breaking blades: Global trends in wind turbine downtime events (2014). http://www.gcube-insurance.com/reports/breaking-blades/
5. Summary of wind turbine accident data to 31 May 2015 – Caithness windfarm information forum (2015)