Algebraic methods for Toeplitz-like matrices and operators. Operator theory; Bd.

Perturbation theory for the Schrödinger operator with a periodic potential. Lect

Perturbation theory for linear operators.

Spectral theory of hyponormal operators. Operator theory; Bd. 10.

Eigenvalue distribution of compact operators. Operator theory; Bd. 16.

A short introduction to perturbation theory for linear operators. Tosio Kato. Ka

Orthogonal systems and convolution operators. Operator theory; Bd. 140.

Multidimensional Periodic Schrödinger Operator: Perturbation Theory and Applicat