Geodesic
Grid Approximation of the First Derivatives of the Solution to the Dirichlet Problem for the Laplace Equation on a~Polygon
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Function spaces, approximation theory, and nonlinear analysis, Tome 255 (2006), pp. 99-115.

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Using the method of composite square and polar grids, we construct approximations of the first derivatives of the solution to the Dirichlet problem for the Laplace equation on a polygon and find error estimates for such approximations. 
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E. A. Volkov. Grid Approximation of the First Derivatives of the Solution to the Dirichlet Problem for the Laplace Equation on a~Polygon. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Function spaces, approximation theory, and nonlinear analysis, Tome 255 (2006), pp. 99-115. http://geodesic.mathdoc.fr/item/TM_2006_255_a7/

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