@Article{ 
  MaPaPiPo22,
  author = { Manfredini, Maria and Palatucci, Giampiero and Piccinini, Mirco and Polidoro, Sergio },
  title = { Hölder continuity and boundedness estimates for nonlinear fractional  equations in the Heisenberg group },
  journal = { J. Geom. Anal. },
  year = { 2023 },
  doi = { 10.1007/s12220-022-01124-6 },
  volume = { 33 },
  number = { 3 },
  pages = { Art. 77 },
  URL = { http://cvgmt.sns.it/paper/5667/ },
  note = { cvgmt preprint}
}