
http://www.bmwi.de/Redaktion/DE/Publikationen/Monatsbericht/schlaglichter-der-wirtschaftspolitik-05-2017.pdf?__blob=publicationFile&v=24

https://reformscotland.com/wp-content/uploads/2018/04/The-VAT-opportunity.pdf

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