@article{MTA_2021_6_2_a6,
     author = {Giorgia Cappello and Patrizia Daniele,Anna Nagurney},
     title = {A system-optimization model for multiclass human migration with migration costs and regulations inspired by the {Covid-19} pandemic},
     journal = {Minimax theory and its applications},
     year = {2021},
     volume = {6},
     number = {2},
     zbl = {1472.90096},
     url = {http://geodesic.mathdoc.fr/item/MTA_2021_6_2_a6/}
}