1. On harmonic univalent mappings;Avci;Ann. Univ. Mariae Curie-Sklodowska Sect. A,1990
2. Harmonic univalent functions;Clunie;Ann. Acad. Aci. Fenn. Ser. A I Math.,1984
3. A survey of harmonic mappings in the plane;Duren;Texas Tech. Univ. Math. Ser.,1992
4. Constants for planar harmonic mappings;Sheil-Small;J. London Math. Soc.,1990
5. Univalent functions with negative coefficients;Silverman;Proc. Amer. Math. Soc.,1975