Geodesic
A point source of oscillation in a neighbourhood of a concave mirror. II
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 10, Tome 89 (1979), pp. 3-13
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The subject of the paper is the construction of the formal high-frequency solution of point-source problem. The reflecting boundary is concave when whispering gallery phenomenon arises. The problem has been solved some years ago in the case of Dirlchlet boundary condition. In this paper the case of Neumann condition is considsred. 
@article{ZNSL_1979_89_a0,
     author = {V. M. Babich},
     title = {A~point source of oscillation in a~neighbourhood of a~concave {mirror.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--13},
     year = {1979},
     volume = {89},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_89_a0/}
}
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V. M. Babich. A point source of oscillation in a neighbourhood of a concave mirror. II. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 10, Tome 89 (1979), pp. 3-13. http://geodesic.mathdoc.fr/item/ZNSL_1979_89_a0/