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Partially supported by grant No. 1593/82 of the Comisión Asesora de Investigación Cientifica y Técnica, Madrid.
Supported by an NSF grant.
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Bruna, J., Korenblum, B. On Kolmogorov's theorem, the Hardy-Littlewood maximal function and the radial maximal function. J. Anal. Math. 50, 225–239 (1988). https://doi.org/10.1007/BF02796124
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DOI: https://doi.org/10.1007/BF02796124