@Article{ 
  maga,
  author = { Magnani, Valentino },
  title = { Contact equations, Lipschitz extensions and isoperimetric inequalities },
  journal = { Calc. Var. Partial Differential Equations  },
  year = { 2010 },
  volume = { 39 },
  number = { 1-2 },
  pages = { 233–271 },
  URL = { http://cvgmt.sns.it/paper/792/ },
  note = { cvgmt preprint}
}