1. Acoustics of a non-homogeneous moving medium;Blokhintsev;NACA TM 1399,1946
2. Wavetrains in inhomogeneous moving media;Bretherton,1968
3. Note on acoustic energy flow in a moving medium;Ribner;UTIAS Technical Note 21,1958
4. Interaction between sound and flow in acoustic cavities: mass, momentum and energy considerations.;Cantrell;Journal of the Acoustical Society of America,1964
5. Acoustic energy in non-uniform flows;Morfey;Journal of Sound and Vibration,1971