References
- Michigan Math. J. v.13 Weyl's theorem for nonnormal operators L. A. Coburn
- Proc. Amer. Math. Soc. v.11 On operators with closed range J. T. Joichi
- Pacific J. Math. v.5 The adjoint semigroup R. S. Phillips
- J. Math. Anal. Appl. v.13 On the essential spectrum of an arbitrary operator I M. Schechter
- Principles of Functional Analysis M. Schechter
- An Introduction to Pseudo-Differential Operators M. W. Wong
- Comm. Appl. Nonlinear Anal. v.2 Asymptotic stability of equilibrium solutions of semilinear evolution Toeplitz-differential equations M. W. Wong