@Article{ 
  ColLis19,
  author = { Collari, Carlo and Lisca, Paolo },
  title = { On symmetric equivalence of symmetric union diagrams },
  journal = { Osaka Journal of Mathematics },
  year = { 2019 },
  volume = { 58 },
  number = { 4 },
  pages = { 755-765 },
  URL = { https://gecogedi.dimai.unifi.it/paper/322/ },
  note = { cvgmt preprint}
}