https://ukandeu.ac.uk/wp-content/uploads/2021/03/Freeports.pdf
http://trade.ec.europa.eu/doclib/docs/2018/october/tradoc_157468.pdf
https://ec.europa.eu/agriculture/sites/agriculture/files/external-studies/2016-bilateral-trade-agreements/exec-sum_en.pdf
https://www.piie.com/sites/default/files/2023-04/pb23-3.pdf