1. Shock wave radiation from a supersonic ducted rotor;Morfey;Aeronautical Journal,1970
2. Multiple pure tone noise generated by fans at supersonic tip speeds;Sofrin,1970
3. Multiple tone generation by transonic compressors;Hawkings;Journal of Sound and Vibration,1971
4. M.R. Fink American Society of Mechanical Engineers Paper No. 71-GT-7.Shock wave behaviour in transonic compressor noise generation.
5. The theoretical and experimental investigations on multiple pure tone noise;Kantola;NASA CR,1971