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 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

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

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.

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

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

On differential operators of infinite order per Steen, Pleun van der