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

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Dirac operators in representation theory по Huang, Jing-Song

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

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

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

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

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

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

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

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