@Article{ 
  AngBis16,
  author = { Angella, Daniele and Bisi, Cinzia },
  title = { Slice-quaternionic Hopf surfaces },
  journal = { J. Geom. Anal. },
  year = { 2019 },
  doi = { 10.1007/s12220-018-0064-9 },
  volume = { 29 },
  number = { 3 },
  pages = { 1837-1858 },
  URL = { https://gecogedi.dimai.unifi.it/paper/10/ },
  note = { cvgmt preprint}
}