Geodesic
Short-wavelength asymptotic solution of the problem of a moving point source in a time-dependent inhomogeneous medium
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 42-51 Cet article a éte moissonné depuis la source Math-Net.Ru

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A uniform short-wavelength asymptotic solution is obtained for the problem of the field of a point source moving with subsonic velocity in a time-dependent inhomogeneous medium; the solution is valid both in a small neighborhood of the source and at a large distance from it. 
@article{ZNSL_1987_165_a5,
     author = {N. S. Grigor'eva},
     title = {Short-wavelength asymptotic solution of the problem of a moving point source in a time-dependent inhomogeneous medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {42--51},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a5/}
}
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N. S. Grigor'eva. Short-wavelength asymptotic solution of the problem of a moving point source in a time-dependent inhomogeneous medium. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 42-51. http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a5/