G. M. Goluzin, Some questions of the theory of univalent functions, Trudy Mat. Inst. Steklov., 27, 1949, 112 ñ. http://mi.mathnet.ru/book1060
G. Golusin, Estimates for analytic functions with bounded mean of the modulus, Travaux Inst. Math. Stekloff, 18, 1946, 88 ñ. http://mi.mathnet.ru/book1044
