On the point source on the domain's boundary
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 130-138

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The article concernes with the shortwave source on the boundary of the domain. An uniform asymptotic expansion in the $k^{-1/4+\varepsilon}$ – neighbourhood of the point-source for arbitrary geometry of the boundary is obtained.
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     author = {Ya. V. Kurylev},
     title = {On the point source on the domain's boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {130--138},
     publisher = {mathdoc},
     volume = {104},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a12/}
}
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Ya. V. Kurylev. On the point source on the domain's boundary. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 130-138. http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a12/