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Received April 15, 1999 / Revised November 29, 1999 / Published online October 11, 2000
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Garofalo, N., Vassilev, D. Regularity near the characteristic set in the non-linear Dirichlet problem and conformal geometry of sub-Laplacians on Carnot groups. Math Ann 318, 453–516 (2000). https://doi.org/10.1007/s002080000127
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DOI: https://doi.org/10.1007/s002080000127