
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf

https://ecipe.org/wp-content/uploads/2021/09/ECI_21_PolicyBrief_12_2021_LY02.pdf

http://henryjacksonsociety.org/wp-content/uploads/2018/05/Global-Britain-in-the-Indo-Pacific-WEB.pdf