http://sro.sussex.ac.uk/id/eprint/110932/1/BP-70.pdf
https://www.washingtonpost.com/opinions/2023/06/08/erdogan-elections-partnership-nato-west/
https://sipri.org/sites/default/files/2017-09/yb17-summary-eng.pdf
https://home.kpmg.com/content/dam/kpmg/nl/pdf/2018/sector/overheid/impact-van-non-tarifaire-handelsbelemmeringen-als-gevolg-van-brexit.pdf