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3. Reed, M., Simon, B.: Methods of Modern Mathematical Physics, IV: Analysis of Operators. Academic Press, New York (1978)
4. Akhiezer, N.I., Glazman, I.M.: Theory of Linear Operators in Hilbert Space. Dover Publ, New York (1993)
5. Amrein, W.O.: Hilbert Space Methods in Quantum Mechanics. EPFL Press, Lausanne (2009)