@article{10_4153_S0008439520000788,
     author = {Dweik, Samer},
     title = {Optimal free export/import regions},
     journal = {Canadian mathematical bulletin},
     pages = {737--751},
     year = {2021},
     volume = {64},
     number = {4},
     doi = {10.4153/S0008439520000788},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000788/}
}