1. S. L. Campbell, Inner functions analytic at a point, Illinois J. Math., to appear.
2. S. L. Campbell, Operator valued inner functions analytic on the closed disc, Pacific J. Math., to appear.
3. Linear Operators;Dunford,1963
4. Harmonic Analysis of Operators on Hilbert Space;Foias,1967
5. Matrix commutator relationships arising from systems of linear ordinary differential equations;Hellman,1954