@Article{ 
  belchenov05,
  author = { Bellettini, Giovanni and Chermisi, Milena and Novaga, Matteo },
  title = { The level set method for systems of PDEs },
  journal = { Comm. Partial Differential Equations },
  year = { 2007 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/926/ },
  note = { cvgmt preprint}
}