@Misc{ 
  belmuga,
  author = { Bellettini, Giovanni and Mugnai, Luca },
  title = { Remarks on the variational nature of the heat equation and of mean curvature flow },
  journal = {  },
  year = { 2006 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1297/ },
  note = { cvgmt preprint}
}