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[1] J. Král: Integral Operators in Potential Theory. Lecture Notes in Mathematics 823, Springer Verlag, Berlin 1980. MR 0590244
[2] J. Král: Note on sets whose characteristic functions have signed measures for their partial derivatives. (Czech). Časopis pěst. mat. 86 (1961), 178 - 194. MR 0136697
[3] B. Winzell: Estimates for the gradient of solutions of the Neumann problem. Report LiTH MAT-76-2. Linköping University. Sweden.
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