1. 1Tam, C. K. W. "Transmission of Spinning Modes in a Slightly Nonuniform Duct/' Journal of Sound and Vibration, Vol. 18, No. 3, Oct. 1971, pp.339-351.
2. Acoustic propagation in waveguides with sinusoidal walls
3. ^Alfredson, R. J. "The Propagation of Sound in a Circular Duct of Continuously Varying Cross-Sectional Area," Journal of Sound and Vibration, Vol.23, 1972, pp.433-442. ^Eversman, W.Cook, E. L., and Beckemeyer, R. J. "A Computational Method for the Investigation of Sound Transmission in Nonuniform Ducts," Proceedings of the Second Intergency Symposium on University Research in Transportation Noise, June 5-7, 1974, North Carolina State University, Raleigh, N. C., pp. 859-873. ^Beckemeyer, R. J. and Eversman, E. "Computational Methods for Studying Acoustic Propagation in Nonuniform Waveguides," AIAA Paper 73-1006, Oct. 15-17, 1973, Seattle, Wash. ;also, AIAA Progress in Astronautics and Aeronautics."Aeroacoustics: Jet and Combustion Noise; Duct Acoustics,"Vol. 37, edited by H. T. Nagamatsu, J. V. O'Keefe, I. R. Schwartz, 1975, pp. 455-469.