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The research was supported by DGICYT under Proyecto PB 91-0538. I would like to thank J. Bonet for interesting conversations and helpful comments on the topic of this paper.
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Galbis, A. Convolution operators with a fundamental solution of finite order. Arch. Math 65, 263–266 (1995). https://doi.org/10.1007/BF01195097
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DOI: https://doi.org/10.1007/BF01195097