Analytic functions star like in one direction

[1] Bieberbach L, 1916, SITZBER K PREUSS AKA, P940

[2] GRONWALL T, 1912, T AM MATH SOC, P445

[3] Herglotz G., 1911, BER VERHANDL SACH MP, V63, P501

[4] MONTEL P, 1925, B SOC MATH FRANCE, V53, P253

[5] On positvie harmonic development and typical real power series [J]. MATHEMATISCHE ZEITSCHRIFT, 1932, 35 : 93 - 121

[6] TITCHMARSH, 1932, THEORY FUNCTIONS, P201

[1] Bieberbach L, 1916, SITZBER K PREUSS AKA, P940

[2] GRONWALL T, 1912, T AM MATH SOC, P445

[3] Herglotz G., 1911, BER VERHANDL SACH MP, V63, P501

[4] MONTEL P, 1925, B SOC MATH FRANCE, V53, P253

[5] On positvie harmonic development and typical real power series [J]. MATHEMATISCHE ZEITSCHRIFT, 1932, 35 : 93 - 121

[6] TITCHMARSH, 1932, THEORY FUNCTIONS, P201