1. Acoustics of a Nonhomogeneous Moving Medium;Blokhintzev,1946
2. Density of acoustical energy in a moving medium;Chernov,1946
3. Wavetrains in inhomogeneous moving media;Bretherton,1968
4. Energy invariant for geometric acoustics in a moving medium;Hayes;Physics of Fluids,1968
5. Note on acoustic energy flow in a moving medium;Ribner,1958