1. A study of propeller noise research;Metzger,1969
2. Judged noisiness of a band of random noise containing an audible pure tone;Kryter;Journal of the Acoustical Society of America,1965
3. Reduction of compressor noise radiation;Lowson;Journal of the Acoustical Society of America,1968
4. Noise of centrifugal fans and rotating cylinders;Huebner;ASHRAE Transactions,1963
5. Controlling the tonal characteristics of aerodynamic noise generated by fan rotors;Mellin;Transactions of the American Society of Mechanical Engineers, Journal of Basic Engineering (Series D),1978