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2. Sources and characteristics of interior noise in general aviation aircraft;Catherines;NASA TM X-72839,1976
3. Cockpit noise intensity: fifteen single engine light aircraft;Tobias;Aerospace Medicine,1969
4. Interior noise levels of two propeller-driven light aircraft;Catherines;NASA TM X-72716,1975
5. Sonic fatigue design guide for military aircraft;Rudder;United States Air Force Flight Dynamics Laboratory, AFFDL-TR-74-112,1974