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This work was supported by NSF Grants: DMS-0202021, DMS-0245242, DMS-0098757.
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Magyar, A., Stein, E.M. & Wainger, S. Maximal operators associated to discrete subgroups of nilpotent Lie groups. J Anal Math 101, 257–312 (2007). https://doi.org/10.1007/s11854-007-0010-4
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DOI: https://doi.org/10.1007/s11854-007-0010-4