@Article{ 
  cheval09,
  author = { Chermisi, Milena and Valdinoci, Enrico },
  title = { A symmetry result for a general class of divergence form PDEs in fibered media },
  journal = { Nonlinear Analysis Series A: Theory, Methods & Applications },
  year = { 2010 },
  volume = { 73 },
  pages = { 695-703 },
  URL = { http://cvgmt.sns.it/paper/8/ },
  note = { cvgmt preprint}
}