Ordinary differential operators by Wang, Aiping 1977-, Zettl, Anton

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Dirac operators in representation theory by Huang, Jing-Song

On the existence of the essential spectrum for a class of differential expressions by Castillo, Maritina T.

On the existence of the essential spectrum for a class of differential expressions having normal maximal extensions by Castillo, Maritina T.

Perturbations of a class of ordinary differential expressions preserving the essential spectrum and the nullities by Victoria, Marie Redina L. Mumpar

Invariance theory, the heat equation, and the Atiyah-Singer index theorem by Gilkey, Peter B.

Invariance theory, the heat equations and the atiyah-singer index theorem. by Gilkey, Peter B.

Functional analysis and two-point differential operators by Locker, John

Spectral theory and wave operators for the Schrndinger equation by Berthier, A. M.

Generalized functions and fourier analysis, an introduction by Challifour, John L.