1. Beig, S., Ravicandran, V.: Directional convexity of harmonic mappings. Bull. Malays. Math. Sci. Soc. 41, 1045–1060 (2018)
2. Clunie, J., Sheil-Small, T.: Harmonic univalent functions. Ann. Acad. Sci. Fenn. Ser. A I Math. 9, 3–25 (1984)
3. Dorff, M., Rolf, J.S.: Anamorphosis, mapping problems, and harmonic univalent functions. In: Explorations in Complex Analysis. Classroom Resource Materials, pp. 197–269. Mathematical Association of America, Washington (2012)
4. Dorff, M., Nowak, M., Wołoszkiewicz, M.: Convolutions of harmonic convex mappings. Complex Var. Elliptic Equ. 57(5), 489–503 (2012)
5. Duren, P., Hengartner, W., Laugesen, R.S.: The argument principle for harmonic functions. Am. Math. Mon. 103(5), 411–415 (1996)