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References:
[1] Béla Szökefalvi-Nagy: Spektraldarstellшig linearer Transformationen des Hilbertschen Raumes. Berlin 1942.
[2] E. Hille, R. S. Phillips: Functional Analysis and Semi-Groups. Providence 1957. MR 0089373
[3] M. Sova: Cosine operator functions. Rozprawy Matematyczne, XLIX, 1966. MR 0193525 | Zbl 0156.15404
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