Geodesic
The Mixed Problem for the Laplace Equation in an Exterior Domain with an Arbitrary Partition of the Boundary
Matematičeskie zametki, Tome 69 (2001) no. 6, pp. 876-891

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In this paper we propose a method for solving the mixed boundary-value problem for the Laplace equation in a connected exterior domain with an arbitrary partition of the boundary. All simple closed curves making up the boundary are divided into three sets. On the elements of the first set the Dirichlet condition is given, on the elements of the second set the third boundary condition is prescribed, and the third set, in turn, is divided into two subsets of simple closed arcs, with the Dirichlet condition prescribed on the elements of one of these subsets and the third boundary condition on the elements of the other subset. The problem is reduced to a uniquely solvable Fredholm equation of the second kind in a Banach space. The third boundary-value problem and the mixed Dirichlet–Neumann problem are particular cases of the problem under study. 
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     author = {P. A. Krutitskii},
     title = {The {Mixed} {Problem} for the {Laplace} {Equation} in an {Exterior} {Domain} with an {Arbitrary} {Partition} of the {Boundary}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {876--891},
     publisher = {mathdoc},
     volume = {69},
     number = {6},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_6_a6/}
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P. A. Krutitskii. The Mixed Problem for the Laplace Equation in an Exterior Domain with an Arbitrary Partition of the Boundary. Matematičeskie zametki, Tome 69 (2001) no. 6, pp. 876-891. http://geodesic.mathdoc.fr/item/MZM_2001_69_6_a6/