6Rademakers L W M M, Braam H, Zaaijer M B, et al. Assessment and Optimization of Operation and Maintenance of Offshore Wind Turbines [C]//Pro ceedings of the European Wind Energy Conference. Madrid,Spain, 2003.
7Obdam T, Rademakers L, Braam H, et al. Estima ting Costs of Operation &Maintenance for Offshore Wind Farms [C]//European Offshore Wind Energy Conference. Milan, Italy, 2007 : ECN-- M-- 07 -- 045.
8Heronemus W E. Pollution--Free Energy From Off- shore Winds[C]//8th Annual Conference and Exposi- tion Marine Technology Society, Washington D C, 1972.
9Butterfield S, Musial W, Jonkman J, et al. Engineer- ing Challenges for Floating Offshore Wind Turbines [C]//Copenhagen Offshore Wind Conference. Copen- hagen, Denmark, 2005:NREL/CP--500--38776.
