@Misc{ 
  Dwe20,
  author = { Dweik, Samer },
  title = { Optimal free export/import regions },
  journal = { Canadian Mathematical Bulletin },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4859/ },
  note = { cvgmt preprint}
}