Geodesic
Some equations for the problem of diffraction by a convex shell
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 8, Tome 62 (1976), pp. 124-125 
A. P. Katchalov. Some equations for the problem of diffraction by a convex shell. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 8, Tome 62 (1976), pp. 124-125. http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a9/
@article{ZNSL_1976_62_a9,
     author = {A. P. Katchalov},
     title = {Some equations for the problem of diffraction by a convex shell},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {124--125},
     year = {1976},
     volume = {62},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a9/}
}
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The paper contains some equations for the problem of the diffraction of a shortwave field by a thin convex shell.