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Dedicated to Professor Shin-Ming Lee on his 70th birthday.
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Shaw, S.Y., Lee, C.S. & Chiou, W.L. Representation formulas for cosine and sine functions of operators II. Aeq. Math. 31, 64–75 (1986). https://doi.org/10.1007/BF02188173
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DOI: https://doi.org/10.1007/BF02188173