1. , and : An Eigenfunction- Eigenvalue Code for Singular Sturm - Liouville Problems, pre-print
2. Automatic Solution of the Sturm-Liouville Problem
3. : Foundations of Modern Analysis, Academic Press, New York/London, 1969
4. and : Linear Operators, Vol. II, Interscience, New York, 1963
5. Some Remarks on Linear Ordinary Quasi-Differential Expressions