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Wasow, Wolfgang The magnitude of an adiabatic invariant of quantum mechanics. (English) Zbl 0399.34026 Result. Math. 1, 88-107 (1978). MSC: 34L99 81P05 34B30 × Cite Format Result Cite Review PDF Full Text: DOI
Heinz, Erhard Beiträge zur Störungstheorie der Spektralzerlegung. (German) Zbl 0043.32603 Math. Ann. 123, 415-438 (1951). × Cite Format Result Cite Review PDF Full Text: DOI EuDML