1. Propagation of finite-amplitude sound waves in tubes;Pernet;Natn. Phys. Lab. aero. Rep. Ac 43,1969
2. Problems arising in the interpretation of aircraft noise measurements;Hay;Br. Aircr. Corp. Acoust. Rep. No. 035,1966
3. Some aspects of recent flight noise measurements;Coles;Rolls-Royce Rep. AP23,1965
4. Report on evaluation of noise around an airport;Copeland;Natn. Phys. Lab. appl. Phys. Div. Rep. AP24,1966
5. Extraneous frequencies generated in air carrying intense sound waves;Thuras;J. acoust. Soc. Am.,1935