@Article{ 
  condel,
  author = { Conti, Sergio and De Lellis, Camillo },
  title = { Sharp upper bounds for a variational problem with singular perturbation },
  journal = { Math. Ann. },
  year = { 2007 },
  volume = { 338 },
  number = { 1 },
  pages = { 119-146 },
  URL = { http://cvgmt.sns.it/paper/1421/ },
  note = { cvgmt preprint}
}