@Article{ 
  belnov97,
  author = { Bellettini, Giovanni and Novaga, Matteo },
  title = { Minimal Barriers for Geometric Evolutions },
  journal = { J. Differential Eqs. },
  year = { 1997 },
  volume = { 139 },
  number = { 1 },
  pages = { 76-103 },
  URL = { http://cvgmt.sns.it/paper/498/ },
  note = { cvgmt preprint}
}