1. E.Alessandrini - D.Boffi - A.Torelli,Study of an obstacle vortex free boundary problem, to appear on Boll. U.M.I.
2. P. L. Duren,Theory of H
p Spaces, Academic Press, New York (1970).
3. P. L.Duren,Univalent Functions, Springer-Verlag (1983).
4. J. B. Garnett,Bounded Analytic Functions, Academic Press, New York (1981).
5. H. Helson,Harmonic Analysis, Addison Wesley, London (1983).