1. Structure of operators with numerical radius one;Ando;Acta Sci. Math. (Szeged),1973
2. Operator Theory and Arithmetic in H∞;Bercovici,1988
3. C.A. Berger, Normal Dilations, Ph.D. Dissertation, Cornell Univ., 1963.
4. Mapping theorems for the numerical range;Berger;Amer. J. Math.,1967
5. The powers of an operator of numerical radius one;Crabb;Michigan Math. J.,1971