1. and Linear Operators (Interscience, New York, 1963).
2. Perturbation Theory for Linear Operators (Springer, New York, 1966).
3. and Fundamentals of the Theory of Operator Algebras I (Academic, New York, 1983).
4. Bases in Banach Spaces (Springer, New York, 1970).
5. General Topology (Van Nostrand, Princeton, 1955).