Geodesic
Diffraction of elastic waves on the wedge-liked obstacles
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 20, Tome 186 (1990), pp. 50-70 
B. V. Budaev. Diffraction of elastic waves on the wedge-liked obstacles. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 20, Tome 186 (1990), pp. 50-70. http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a5/
@article{ZNSL_1990_186_a5,
     author = {B. V. Budaev},
     title = {Diffraction of elastic waves on the wedge-liked obstacles},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {50--70},
     year = {1990},
     volume = {186},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a5/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

By the tecnique of Zommerfeld integrals the problem of diffraction is reduced to some functional equation in a complex domain, known in literature as ones with a non-Carleman shift. By the theory of pseudodifferential operators these equations are transformed to Fredholm's integral equations.