Geodesic
Short-wave asymptotics of the solution of the problem of a~point source in an inhomogeneous moving medium
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 41-48

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The leading term is obtained for the short-wave asymptotics of the field of a point source in a small neighborhood of it and also an expression for the excitation coefficient of the wave in the region where the ray representation is valid for an infinite, inhomogeneous, vortex-free, moving medium with constant entropy and for a weakly vortical medium for which the speed of motion is small. 
@article{ZNSL_1984_140_a3,
     author = {N. S. Grigor'eva},
     title = {Short-wave asymptotics of the solution of the problem of a~point source in an inhomogeneous moving medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {41--48},
     publisher = {mathdoc},
     volume = {140},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a3/}
}
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N. S. Grigor'eva. Short-wave asymptotics of the solution of the problem of a~point source in an inhomogeneous moving medium. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 41-48. http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a3/