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Determination of the Optimum Twist of an Airscrew Blade by the "calculus of Variations"

Christopher Noel Hunter LockR. C. PankhurstR. G. Fowler

出版	H.M. Stationery Office, 1942
URL	http://books.google.com.hk/books?id=YP3gJAAACAAJ&hl=&source=gbs_api