@Misc{ 
  DeLRez20,
  author = { De Lellis, Camillo and Reza, M. Pakzad },
  title = { The geometry of flat $C^{1,\alpha}$ isometric immersions },
  journal = {  },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4923/ },
  note = { cvgmt preprint}
}