McGugan, M, Larsen, G C, Sørensen, B F, Borum, K K & Engelhardt, J 2008, Fundamentals for remote condition monitoring of offshore wind turbines . Denmark. Forskningscenter Risoe. Risoe-R, no. 1639(EN), Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi, Roskilde .