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2. Some Work with Rotating Wing Aircraft;Fitzwilliams;Journal of the Helicopter Association of Great Britain.,1947
3. Gregory J. D. L. and Coombes R. W. An Account of Some Longitudinal Stability Tests on a Dragonfly Helicopter. Unpublished A. & A.E.E. Report.
4. Flight Requirements for the Operation of Rotorcraft.
5. Flight Testing of Helicopters;O'Hara;Journal of the Helicopter Association of Great Britain.,1950