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@article{TM_1968_103_a4, author = {I. A. Danilova}, title = {Exterior boundary value problems for the {Helmholtz} equation}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {58--72}, publisher = {mathdoc}, volume = {103}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1968_103_a4/} }
I. A. Danilova. Exterior boundary value problems for the Helmholtz equation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Boundary value problems for differential equations. Part II, Tome 103 (1968), pp. 58-72. http://geodesic.mathdoc.fr/item/TM_1968_103_a4/