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2. (3) S. Takami, K. Nakahara, H. Takahara, M. Shimizu, K. Taketoh, A. Ichikawa, S. Sekiya, and T. Sakai: “Development and Performance Test of Darrieus Type Wind Power Generator”, J. JSER, Vol. 5, No. 4, pp. 89-95 (1984) (in Japanese)