@Misc{ 
  AltBal19,
  author = { Altavilla, Amedeo and Ballico, Edoardo },
  title = { Algebraic surfaces with infinitely many twistor lines },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/323/ },
  note = { cvgmt preprint}
}