Geodesic
The boundedness in a closed region of the gradient of a harmonic funcion
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 2 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {B. N. Khimchenko},
     title = {The boundedness in a~closed region of the gradient of a~harmonic funcion},
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}
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B. N. Khimchenko. The boundedness in a closed region of the gradient of a harmonic funcion. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 2. http://geodesic.mathdoc.fr/item/RM_1970_25_2_a16/

[1] Kjell-ove Widman, “Inequalities for the Green function and boundary continuity of the gradient of solutions of elliptic differential equations”, Math. Scand., 21 (1967), 17–37 | MR

[2] B. N. Khimchenko, “O povedenii supergarmonicheskoi funktsii vblizi granitsy oblasti tipa $A^{(1)}$”, Differents. uravn., 5:10 (1969) | Zbl