@Misc{ 
  LeDZüs19,
  author = { Le Donne, Enrico and Züst, Roger },
  title = { Space of signatures as inverse limits of Carnot groups },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4493/ },
  note = { cvgmt preprint}
}