@Article{ 
  CagPerStö19,
  author = { Cagnetti, Filippo and Perugini, Matteo and Stöger, Dominik },
  title = { Rigidity for perimeter inequality under spherical symmetrisation },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4437/ },
  note = { cvgmt preprint}
}