1. Is the unducted fan tomorrow's subsonic engine?;Brahney;Aerospace Engineering,1985
2. The acoustic analogy—thirty years on;Ffowcs Williams;IMA Journal of Applied Mathematics,1984
3. A numerical technique for calculation of the noise of high-speed propellers with advanced blade geometry;Nystrom;NASA Technical Paper 1662,1980
4. Aircraft noise prediction program theoretical manual—propeller aerodynamics and noise,1986
5. The importance of quadrupole sources in prediction of transonic tip speed propeller noise;Hanson;Journal of Sound and Vibration,1979