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 
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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Voir la notice de l'article provenant de la source Math-Net.Ru

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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