1. Contraction operators quasisimilar to a unilateral shift;Alexander, V. T.;Trans. Amer. Math. Soc.,1984
2. Mathematical Surveys, No. V;Bergman, Stefan,1970
3. A problem of Sz.-Nagy;van Casteren, Jan A.;Acta Sci. Math. (Szeged),1980
4. Complex geometry and operator theory;Cowen, M. J.;Acta Math.,1978
5. Operators possessing an open set of eigenvalues;Cowen, M. J.,1983