@Misc{ 
  PinSpeZim18,
  author = { Pinamonti, Andrea and Speight, Gareth and Zimmerman, Scott },
  title = { A $C^m$ Whitney extension theorem for horizontal curves in the Heisenberg group },
  journal = { Trans AMS },
  year = { 2018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3966/ },
  note = { cvgmt preprint}
}