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

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Dirac operators in representation theory per Huang, Jing-Song

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

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

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

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

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

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

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

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