1. On two problems concerning linear transformations in hilbert space
2. Probabilistic and Analytical Aspects of the Umbral Calculus, CWI Tract Vol. 119 (Stichting Mathematisch Centrum, Centrum voor Wiskunde en Informatica, Amsterdam, 1997).
3. , and , Commutative Normed Rings (Chelsea, New York, 1964).
4. Operators commuting with a weighted shift
5. Cyclic vectors and parts of the spectrum of a weighted shift