Geodesic
Differential properties of solutions of elliptic boundary-value problems with power singularities on the right-hand sides
Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 211-219.

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Exact bounds are obtained for the derivatives of the solutions of general boundary-value problems for elliptic equations of order $2m$ in the neighborhood of a power singularity. The order of the singularity is arbitrary, and it can be at an interior point or on the boundary. 
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Yu. P. Krasovskii. Differential properties of solutions of elliptic boundary-value problems with power singularities on the right-hand sides. Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 211-219. http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a11/

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