1. Waves in Fluids;Lighthill,1979
2. Theoretical Acoustics;Morse,1986
3. Acoustics: An Introduction to its Physical Principles and Applications;Pierce,1981
4. Acoustic energy in non-uniform flows;Morfey;Journal of Sound and Vibration,1971
5. Energy flux in duct flow;Möhring;Journal of Sound and Vibration,1971