1. On the sound field of a rotating propeller;Gutin;N.A.C.A. tech. Memo. No. 1195 (Translation),1947
2. Axial flow compressor noise studies;Tyler;S.A.E. Aeronautics meeting, Preprint 345D,1961
3. Bakerian Lecture. Sound generated aerodynamically;Lighthill,1962
4. The sound field for singularities in motion;Lowson,1964
5. A tabulation of helicopter rotor blade differential pressures, stresses, and motions as measured in flight;Sheiman;N.A.S.A. tech. Memo. TMX-952,1964