@Article{ 
  belnov96a,
  author = { Bellettini, Giovanni and Novaga, Matteo },
  title = { Barriers for a Class of Geometric Evolutions Problems },
  journal = { Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. Rend. Lincei, serie IX },
  year = { 1997 },
  volume = { VIII },
  number = { 2 },
  pages = { 119-128 },
  URL = { http://cvgmt.sns.it/paper/233/ },
  note = { cvgmt preprint}
}