@Misc{ 
  Bel13,
  author = { Bellettini, Giovanni },
  title = { Lecture Notes on Mean Curvature Flow, Barriers and Singular Perturbations },
  journal = { Edizioni della Scuola Normale },
  year = { 2013 },
  pages = { xviii-329 },
  URL = { http://cvgmt.sns.it/paper/2580/ },
  note = { cvgmt preprint}
}