@Misc{ 
  AmbBer15,
  author = { Ambrosio, Luigi and Bertrand, Jerome },
  title = { DC Calculus },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2698/ },
  note = { cvgmt preprint}
}