@Article{ 
  belnov96,
  author = { Bellettini, Giovanni and Novaga, Matteo },
  title = { Comparison Results between Minimal Barriers and Viscosity Solutions for Geometric Evolutions },
  journal = { Ann. Sc. Norm. Sup. Pisa Cl. Sci. },
  year = { 1998 },
  volume = { XXVI },
  pages = { 97-131 },
  URL = { http://cvgmt.sns.it/paper/455/ },
  note = { cvgmt preprint}
}