1. B. Beauzamy,Introduction to Operator Theory and Invariant Subspaces,NorthHolland, Amsterdam, 1988.
2. H. Bercovici,Operator Theory and Arithmetic in, H
∞
Math. Surveys Mono-graphs 26, Amer. Math. Soc., Providence, R. I., 1988.
3. H.BercoviciC.Foias and C.Pearcy,Dual Algebras with Applications to Invariant Subspaces and Dilation Theory,CBMS Regional Conference Series in Math. No.56Amer. Math. Soc., Providence, R. I., 1985.
4. H.Bercovici and L. Kérchy, Quasisimilarity and properties of C
11 the commutant of Cu contractions, Acta Sci. Math. (Szeged), 45 (1983), 67–74.
5. H. Bercovici and L. Kérchy, On the spectra of C
11-contractions, Proc. Amer. Math. Soc., 95 (1985), 412–418.