1. Subnormal operators;Bram;Duke Math. Jour.,1955
2. Invariant subspaces and rational approximation;Brennan;J. Functional Analysis,1971
3. The essential spectrum of some Toeplitz operators;Clancey,1974
4. The local spectral behavior of completely subnormal operators;Clancey;Trans. Amer. Math. Soc.,1972
5. Rational approximation on the union of sets;Davie,1971