@Misc{ 
  CaCoDeMa13,
  author = { Cagnetti, Filippo and Colombo, Maria and De Philippis, Guido and Maggi, Francesco },
  title = { Essential connectedness and the rigidity problem for Gaussian
  symmetrization },
  journal = { J. Eur. Math. Soc. },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2128/ },
  note = { cvgmt preprint}
}