1. P. L. Duren, Theory of HP Spaces, Academic Press, New York (1970).
2. P. J. Eenigenburg, ?The integral means of analytic functions,? Q. J. Math.,32, 313?322 (1981).
3. P. Koosis, Introduction to HP Spaces, Cambridge Univ. Press (1979).
4. A. Zygmund, Trigonometric Series, Cambridge Univ. Press.
5. F. A. Shamoyan, ?Imbedding theorems and characteristic of traces in the spaces HP (Un), 0