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2. Helicopter noise—state of the art;George;American Institute of Aeronautics and Astronautics Paper 77-1337, Atlanta, Georgia,1977
3. The status of rotor noise technology;White;Journal of the American Helicopter Society,1980
4. Sound generation by turbulence and surfaces in arbitrary motion
5. Theory of open supersonic rotor noise;Hawkings;Journal of Sound and Vibration,1974