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Translated from Matematicheskie Zametki, Vol. 51, No. 5, pp. 151–153, May, 1992.
This note was prepared during the winter semester of 1990–91 at the Mathematics Institute of ZUrich University. The author express his gratitude to Prof. R. Hess and Prof. W. Arendt for their help.
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Piskarev, S.I. Compactness properties in the theory of the cosine operator functions. Math Notes 51, 528–530 (1992). https://doi.org/10.1007/BF01262191
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DOI: https://doi.org/10.1007/BF01262191