@Misc{ 
  farval09,
  author = { Farina, Alberto and Valdinoci, Enrico },
  title = { 1-D symmetry for solutions of semilinear and quasilinear elliptic equations  },
  journal = { Trans. of the AMS },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1597/ },
  note = { cvgmt preprint}
}