Geodesic
Multivalent $\alpha$ — convex harmonic mappings
Problemy analiza, no. 9 (2002), pp. 3-13 
A. Ganczar. Multivalent $\alpha$ — convex harmonic mappings. Problemy analiza, no. 9 (2002), pp. 3-13. http://geodesic.mathdoc.fr/item/PA_2002_9_a0/
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     author = {A. Ganczar},
     title = {Multivalent $\alpha$ {\textemdash} convex harmonic mappings},
     journal = {Problemy analiza},
     pages = {3--13},
     year = {2002},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2002_9_a0/}
}
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In this paper we give coefficient conditions for complex-valued harmonic functions that are ultivalent, sense-preserving and $\alpha$-convex. We determine the extreme points, distortion and covering theorems for these mappings.