Smoothness of Lipschitz Minimal Intrinsic Graphs in Heisenberg Groups

@inproceedings{Capogna2007SmoothnessOL,
  title={Smoothness of Lipschitz Minimal Intrinsic Graphs in Heisenberg Groups},
  author={Luca Capogna and Giovanna Citti and Maria Manfredini},
  year={2007}
}
We prove that Lipschitz intrinsic graphs in the Heisenberg groups Hn, with n > 1, which are vanishing viscosity solutions of the minimal surface equation are smooth.