Geodesic
Best-possible estimates of solutions of the Dirichlet problem for linear elliptic nondivergence equations of second order in a neighborhood of a conical point of the boundary
Sbornik. Mathematics, Tome 74 (1993) no. 1, pp. 185-201 Cet article a éte moissonné depuis la source Math-Net.Ru

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Best-possible estimates are obtained for solutions of the Dirichlet problem for linear elliptic nondivergence equations of second order near a conical point of the boundary of the domain under minimal conditions on the smoothness of the coefficients of the equation. 
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M. V. Borsuk. Best-possible estimates of solutions of the Dirichlet problem for linear elliptic nondivergence equations of second order in a neighborhood of a conical point of the boundary. Sbornik. Mathematics, Tome 74 (1993) no. 1, pp. 185-201. http://geodesic.mathdoc.fr/item/SM_1993_74_1_a13/

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