1. A finite element formulation for sound propagation in axisymmetric ducts containing compressible mean flow;Abrahamson;American Institute of Aeronautics and Astronautics Paper 77-1301,1977
2. Use of finite element techniques in the determination of the acoustic properties of turbofan inlets;Sigman;American Institute of Aeronautics and Astronautics Paper 77-18,1977
3. A finite element method for transmission in non-uniform ducts without flow: comparison with the method of weighted residuals;Astley;Journal of Sound and Vibration,1978
4. A finite element simulation of sound attenuation in a finite duct with a peripherally variable liner;Watson;NASA TM X-74080,1977
5. A multi-modal solution for the transmission of sound in nonuniform ducts;Eversman;American Institute of Aeronautics and Astronautics Paper 76-497,1976