@Misc{ 
  CapPinSpe21,
  author = { Capolli, Marco and Pinamonti, Andrea and Speight, Gareth },
  title = { A $C^k$ Lusin approximation theorem for real-valued functions on Carnot Groups },
  journal = { Indiana Univ. Math. J. },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5210/ },
  note = { cvgmt preprint}
}