@Article{ 
  LeDSpe16,
  author = { Le Donne, Enrico and Speight, Gareth },
  title = { Lusin Approximation for Horizontal Curves in Step 2 Carnot Groups },
  journal = {  Calculus of Variations and Partial Differential Equations },
  year = { 2016 },
  volume = { 55 },
  number = { 5 },
  pages = { 1-22 },
  URL = { http://cvgmt.sns.it/paper/2929/ },
  note = { cvgmt preprint}
}