1. M. Fekete and G. Szegö, Eine Bemerkung über ungerade schlichte Funktionen, J. London Math. Soc. vol. 8 (1933) pp. 85-89.
2. G. M. Golusin, Some problems in the theory of univalent functions, Trudy Mat. Inst. Steklov. no. 27 (1949) (Russian).
3. Reihe: Moderne Funktionentheorie;Jenkins, James A.,1958
4. On certain coefficients of univalent functions;Jenkins, James A.,1960
5. On certain coefficients of univalent functions;Jenkins, James A.,1960