Geodesic
A general boundary value problem for the Helmholtz equation in the plane angle
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 2 
A. E. Merzon. A general boundary value problem for the Helmholtz equation in the plane angle. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 2. http://geodesic.mathdoc.fr/item/RM_1977_32_2_a13/
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     title = {A general boundary value problem for the {Helmholtz} equation in the plane angle},
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     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_2_a13/}
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[1] A. I. Komech, “Ellipticheskie kraevye zadachi na mnogoobraziyakh s kusochno-gladkoi granitsei”, Matem. sb., 92:1 (1973), 89–134 | Zbl

[2] V. A. Malyshev, Sluchainye bluzhdaniya, uravneniya Vinera-Khopfa v chetverti ploskosti, avtomorfizmy Galua, MGU, M., 1970 | MR

[3] A. E. Merzon, “O razreshimosti differentsialnykh uravnenii s postoyannymi koeffitsientami v konuse”, DAN, 211:2 (1973), 285–288 | MR | Zbl