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On a problem of extension of the solutions for elliptic equations. (Russian) Zbl 0766.35010
The authors discuss “balayage” problems and boundary value problems for first order and second order elliptic equations.

MSC:
35J25 Boundary value problems for second-order elliptic equations
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
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