@Misc{ 
  belmugb,
  author = { Bellettini, Giovanni and Mugnai, Luca },
  title = { Approximation of the Helfrich's functional via Diffuse Interfaces },
  journal = {  },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1550/ },
  note = { cvgmt preprint}
}