Geodesic
Harmonic mappings in the exterior of the unit disk
Annales Universitatis Mariae Curie-Skłodowska. Mathematica , Tome 54 (2010) no. 1.

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In this paper we consider a class of univalent orientation-preserving harmonic functions defined on the exterior of the unit disk which satisfy the condition∑_n=1^∞n^p(|a_n|+|b_n|)≤ 1. We are interested in finding radius of univalence and convexity for such class and we find extremal functions. Convolution, convex combination, and explicit quasiconformal extension for this class are also determined.
Keywords: Harmonic mapping, meromorphic, quasiconformal extension, radius of convexity, radius of univalence 
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Gregorczyk, Magdalena; Widomski, Jarosław. Harmonic mappings in the exterior of the unit disk. Annales Universitatis Mariae Curie-Skłodowska. Mathematica , Tome 54 (2010) no. 1. http://geodesic.mathdoc.fr/item/AUM_2010_54_1_a1/

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