1. K. Hoffman, Banach Spaces of Analytic Functions, Prentice-Hall, Englewood Cliffs, New Jersey (1962).
2. V. P. Khavin, J. Sov. Math.,2, No. 2, 228?231 (1974).
3. F. A. Shamoyan, J. Sov. Math.,2, No. 2, 232?234 (1974).
4. F. A. Shamoyan, Izv. Akad. Nauk Armen. SSR, Ser. Mat.,8, No. 6, 485?497 (1973).
5. F. A. Shamoyan, J. Sov. Math.,8, No. 1, 152?156 (1977).