
http://www.europarl.europa.eu/ftu/pdf/en/FTU_5.9.1.pdf

https://www.naco.org/sites/default/files/documents/Analysis-of-COVID-19s-Impact-on-County-Finances-and-Implications-for-the-US-Economy.pdf

https://blogs.lse.ac.uk/brexit/2019/12/03/a-missed-opportunity-revisiting-the-euro-referendum-that-never-was-from-a-historical-perspective/