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- ItemOptimal elliptic regularity at the crossing of a material interface and a Neumann boundary edge(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2010) Kaiser, Hans-Christoph; Rehberg, JoachimWe investigate optimal elliptic regularity of anisotropic div-grad operators in three dimensions at the crossing of a material interface and an edge of the spatial domain on the Neumann boundary part within the scale of Sobolev spaces.