1. European Wind Energy Association (EWEA). Deep water – The next step for offshore wind energy. http://www.ewea.org/fileadmin/files/library/publications/reports/Deep_Water.pdf; July 2013, p. 15-17.
2. European Wind Energy Association (EWEA). The European offshore wind industry - key trends and statistics 2013. http://www.ewea.org/fileadmin/files/library/publications/statistics/European_offshore_statistics_2013.pdf; January 2014, p. 16-18.
3. Roland Berger Strategy Consultants. Offshore wind toward 2020 - On the pathway to cost competitiveness. http://www.rolandberger.com/media/pdf/Roland_Berger_Offshore_Wind_Study_20130506.pdf; April 2013, p. 6.
4. Fraunhofer Institut for Solar Energy Systems (ISE). Stromgestehungskosten erneuerbarer Energien – Studie. http://www.ise.fraunhofer.de/de/veroeffentlichungen/veroeffentlichungen-pdf-dateien/studien-und-konzeptpapiere/studie-stromgestehungskosten-erneuerbare-energien.pdf; November 2013, p. 36.
5. Raphael Ebenhoch. Comparative levelized cost of energy analysis for a floating offshore wind turbine concept. Student research paper at Stuttgart Wind Energy (SWE); July 2014.