@Misc{ 
  dangarnhi02a,
  author = { Danielli, Donatella and Garofalo, Nicola and Nhieu, Duy-Minh },
  title = { Minimal surfaces, surfaces of constant mean curvature and isoperimetry in Carnot groups },
  journal = {  },
  year = { 2002 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/492/ },
  note = { cvgmt preprint}
}