@Misc{ 
  CirVez16a,
  author = { Ciraolo, Giulio and Vezzoni, Luigi },
  title = { A rigidity problem on the round sphere },
  journal = { Commun. Contemp. Math. },
  year = { 2016 },
  doi = { 10.1142/S0219199717500018 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/225/ },
  note = { cvgmt preprint}
}