1. Hovering impulsive noise—some measured and calculated results;Boxwell;NASA CP 2052, Part 1, Paper 15,1978
2. An evaluation of linear acoustic theory for a hovering rotor;Morris;NASA TM 80059,1979
3. The importance of quadrupole sources in prediction of transonic tip speed propeller noise;Hanson;Journal of Sound and Vibration,1979
4. The exact numerical calculation of propeller noise;Woan;American Institute of Aeronautics and Astronautics Paper,1978
5. Experimental verification of propeller noise prediction;Succi;American Institute of Aeronautics and Astronautics Paper,1980