@Article{ 
  cramal07b,
  author = { Crasta, Graziano and Malusa, Annalisa },
  title = { A sharp uniqueness result for a class of variational problems solved by a distance function. },
  journal = { J. Differential Equations },
  year = { 2007 },
  volume = { 243 },
  pages = { 427-447 },
  URL = { http://cvgmt.sns.it/paper/1127/ },
  note = { cvgmt preprint}
}