@Misc{ 
  LeDNal24,
  author = { Le Donne, Enrico and Nalon, Luca },
  title = { Euclidean rectifiability of sub-Finsler spheres in free-Carnot groups of
  step 2 },
  journal = {  },
  year = { 2024 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6500/ },
  note = { cvgmt preprint}
}