@Misc{ 
  gaz05,
  author = { Gazzola, Filippo },
  title = { No geometric approach for general overdetermined elliptic problems with nonconstant source },
  journal = {  },
  year = { 2005 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1219/ },
  note = { cvgmt preprint}
}