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Supported by Grant PB 91-0449 of the DGICYT and the University of the Basque Country.
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Calderón, C., de Velasco, M.J. Gaps betweenr-free integers. Arch. Math 63, 140–144 (1994). https://doi.org/10.1007/BF01189887
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DOI: https://doi.org/10.1007/BF01189887