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This research was supported by the National Science Foundation (in U.S.A.)
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Kinukawa, M. Contractions of fourier coefficients and Fourier integrals. J. Anal. Math. 8, 377–406 (1960). https://doi.org/10.1007/BF02786857
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DOI: https://doi.org/10.1007/BF02786857