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Supported in part by National Science Foundation grants MPS72-05055 A02 and GP36318, respectively.
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Rothschild, L.P., Stein, E.M. Hypoelliptic differential operators and nilpotent groups. Acta Math. 137, 247–320 (1976). https://doi.org/10.1007/BF02392419
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DOI: https://doi.org/10.1007/BF02392419