Perturbations by Quadratic Forms and Invariance of Essential Spectra.
On the asymptotic distribution of the eigenvalue branches of the Schrödinger operator H... W in a spectral gap of H.
Periodic Schrödinger Operators with (Non-Periodic) Magnetic and Electric Potentials.
Eine Variationsmethode für elliptische Differentialoperatoren mit strengen Nichtlinearitäten.
On the Essential Spectrum of Schrödinger Operators with Spherically Symmetric Potentials.
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