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@article{MZ_1971__119_171498, author = {Rainer W\"ust}, title = {Generalisation of {Rellich's} {Theorem} on {Perturbation} of {(Essentially)} {Selfadjoin} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {276--280}, publisher = {mathdoc}, volume = {119}, year = {1971}, zbl = {0228.47010}, url = {http://geodesic.mathdoc.fr/item/MZ_1971__119_171498/} }
Rainer Wüst. Generalisation of Rellich's Theorem on Perturbation of (Essentially) Selfadjoin Operators.. Mathematische Zeitschrift, Tome 119 (1971), pp. 276-280. http://geodesic.mathdoc.fr/item/MZ_1971__119_171498/