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2. Wind energy conversion: an introduction;Musgrove;IEE Proc.,1983
3. Directly-driven permanent magnet excited synchronous generator for variable speed operation;Weh,1988
4. Permanent magnet generators for wind power applications;Spooner,1992
5. Modeling and control of a wind-driven induction generator for water storage heating;Daly;IEE Proc. A,1983