Perturbations by Quadratic Forms and Invariance of Essential Spectra.
Hempel, Rainer
Mathematische Zeitschrift, Tome 185 (1984), p. 281-290 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1984-01-01
EUDML-ID : urn:eudml:doc:173402 
@article{GDZPPN002428695,
     title = {Perturbations by Quadratic Forms and Invariance of Essential Spectra.},
     journal = {Mathematische Zeitschrift},
     volume = {185},
     year = {1984},
     pages = {281-290},
     zbl = {0514.47011},
     url = {http://dml.mathdoc.fr/item/GDZPPN002428695}
}

Hempel, Rainer. Perturbations by Quadratic Forms and Invariance of Essential Spectra.. Mathematische Zeitschrift, Tome 185 (1984) pp. 281-290. http://gdmltest.u-ga.fr/item/GDZPPN002428695/