1. Investigations on nonlinear Helmholtz resonators (in German);Barthel;Frequenz,1958
2. Acoustic nonlinearity of an orifice;Ingard;Journal of the Acoustical Society of America,1967
3. Effect of flow on the acoustic resonances of an open-ended duct;Ingard;Journal of the Acoustical Society of America,1975
4. Duct wall impedance control as an advanced concept for acoustic suppression;Dean;NASA CR-134998,1975
5. Experiments on the transmission of sound through jets;Bechert;American Institute of Aeronautics and Astronautics Paper 77-1278,1977