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Research partially supported by NSF grant no. DMS-87-04209 and DMS-90-04062
Research partially supported by NSF grant no. DMS-89-08234
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Cao, HD., Yau, ST. Gradient estimates, Harnack inequalities and estimates for heat kernels of the sum of squares of vector fields. Math Z 211, 485–504 (1992). https://doi.org/10.1007/BF02571441
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DOI: https://doi.org/10.1007/BF02571441