Brüning, E.; Demuth, M.; Gesztesy, F. Invariance of the essential spectra for perturbations with unbounded hard cores. (English) Zbl 0632.47009 Lett. Math. Phys. 13, 69-77 (1987). Reviewer: H.S.Nur MSC: 47A55 47A25 47A10 30B20 PDFBibTeX XMLCite \textit{E. Brüning} et al., Lett. Math. Phys. 13, 69--77 (1987; Zbl 0632.47009) Full Text: DOI
Brüning, Erwin; Gesztesy, F. On essential spectra of hard-core type Schrödinger operators. (English) Zbl 0586.35035 J. Phys. A 18, L7-L11 (1985). MSC: 35J10 35P05 35P20 47A25 PDFBibTeX XMLCite \textit{E. Brüning} and \textit{F. Gesztesy}, J. Phys. A, Math. Gen. 18, L7--L11 (1985; Zbl 0586.35035)