https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
https://committees.parliament.uk/publications/4976/documents/50058/default/
https://ec.europa.eu/agriculture/sites/agriculture/files/external-studies/2016-bilateral-trade-agreements/exec-sum_en.pdf
https://blogs.lse.ac.uk/brexit/2019/12/03/a-missed-opportunity-revisiting-the-euro-referendum-that-never-was-from-a-historical-perspective/