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W. J. Walker, Boundary Behaviour of Level Curves of Harmonic Functions, Proceedings of the American Mathematical Society, Vol. 91, No. 1 (May, 1984), pp. 102-104 ...
M. Papadimitrakis, On Convexity of Level Curves of Harmonic Functions in the Hyperbolic Plane, Proceedings of the American Mathematical Society, Vol. 114, No. 3 (Mar., 1992), pp. 695-698 ...