https://unctad.org/en/PublicationsLibrary/diaeiainf2019d1_en.pdf?user=46
https://www.instituteforgovernment.org.uk/sites/default/files/publications/5704%20IFG%20-%20Frictionless%20Trade%20Web.pdf
https://www.economiesuisse.ch/de/artikel/faktencheck-bilaterale-iii
https://blogs.sussex.ac.uk/uktpo/2017/06/12/disentangling-brexit-trade-politics-and-policies/