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Supported in part by DGICYT Grant PB 91-0304 (Spain)
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González, M., Martínez-Abejón, A. Supertauberian operators and perturbations. Arch. Math 64, 423–433 (1995). https://doi.org/10.1007/BF01197221
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DOI: https://doi.org/10.1007/BF01197221