Geodesic
Excitation of modulated waves in inhomogenious media
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 111-122

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Excitation of scalar and elasic waves by point sources is treated by boundary layer technique. Higher terms of asymptotics are discussed. 
@article{ZNSL_1981_104_a10,
     author = {A. P. Kiselev},
     title = {Excitation of modulated waves in inhomogenious media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {111--122},
     publisher = {mathdoc},
     volume = {104},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a10/}
}
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A. P. Kiselev. Excitation of modulated waves in inhomogenious media. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 111-122. http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a10/