@Misc{ 
  PinSpe17,
  author = { Pinamonti, Andrea and Speight, Gareth },
  title = { Universal Differentiability Sets in Carnot Groups of Arbitrarily High Step },
  journal = { Israel Journal of Mathematics },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3679/ },
  note = { cvgmt preprint}
}