1. Wind Energy in Europe: Outlook to 2023
https://www.anev.org/wp-content/uploads/2019/10/Market-outlook-2019.pdf
2. Operation and Maintenance Costs of Wind Generated Power
https://www.wind-energy-the-facts.org
3. Wind Blade Repair: Planning, Safety, Flexibility
https://www.compositesworld.com/columns/wind-blade-repair-planning-safety-flexibility(2)
4. Condition Based Maintenance: A UK pilot study;Ruhul;Int. J. Facil. Manag.,2015