@Misc{ 
  CatManMaz11,
  author = { Catino, Giovanni and Mantegazza, Carlo and Mazzieri, Lorenzo },
  title = { On the global structure of conformal gradient solitons with nonnegative
  Ricci tensor },
  journal = {  },
  year = { 2011 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/537/ },
  note = { cvgmt preprint}
}