@Misc{ 
  Mer20a,
  author = { Merlo, Andrea },
  title = { Marstrand-Mattila rectifiability criterion for $1$-codimensional  measures in Carnot Groups },
  journal = { Analysis & PDE },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4832/ },
  note = { cvgmt preprint}
}