@Article{ 
  BisSto16,
  author = { Bisi, Cinzia and Stoppato, Caterina },
  title = { Landau's theorem for slice regular functions on the quaternionic unit ball },
  journal = { Internat. J. Math. },
  year = { 2017 },
  doi = { 10.1142/S0129167X17500173 },
  volume = { 28 },
  number = { 3 },
  pages = { 1-21 },
  URL = { https://gecogedi.dimai.unifi.it/paper/147/ },
  note = { cvgmt preprint}
}