References
Kato, T.: Perturbation theory for linear operators. Berlin-Heidelberg-New York: Springer 1966.
Wüst, R.: Stabilität der Selbstadjungiertheit gegenüber Störungen. Dissertation RWTH Aachen 1970.
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Wüst, R. Generalisations of Rellich's theorem on perturbation of (essentially) selfadjoint operators. Math Z 119, 276–280 (1971). https://doi.org/10.1007/BF01113402
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DOI: https://doi.org/10.1007/BF01113402