1. Grundlehren der mathematischen Wissenschaften;P L Duren,1983
2. Goodman A. W., Univalent Functions. Vol. 1 and 2, Mariner Publishing Co., Tampa, Florida (1983).
3. Szegö G., “Zur Theorie der schlichten Abbildungen,” Math. Ann., 100, No. 1, 188–211 (1928).
4. Iliev L., “Classical extremal problems for univalent functions,” in: Complex Analysis. Vol. 11, Banach Center Publ., Warsaw, 1979, pp. 89–110.
5. Robertson M. S., “The partial sums of multivalently star-like functions,” Ann. Math., 42, No. 2, 829–838 (1941).