@Article{ 
  MonSarSec19,
  author = { Monguzzi, Alessandro and Sarfatti, Giulia and Seco, Daniel },
  title = { Quaternionic inner and outer functions },
  journal = { Concrete Operators },
  year = { 2019 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/366/ },
  note = { cvgmt preprint}
}