http://trade.ec.europa.eu/doclib/docs/2017/june/tradoc_155642.pdf
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
https://www.ips-journal.eu/regions/global/eu-latin-america-summit-6869/
https://merics.org/sites/default/files/2021-01/Decoupling_EN.pdf