@Article{ 
  belmasnov05,
  author = { Bellettini, Giovanni and Masala, M. and Novaga, Matteo },
  title = { A conjecture of De Giorgi on the squared distance function },
  journal = { J. Convex Anal. },
  year = { 2007 },
  volume = { 14 },
  number = { 2 },
  pages = { 351-358 },
  URL = { http://cvgmt.sns.it/paper/41/ },
  note = { cvgmt preprint}
}