https://curia.europa.eu/jcms/upload/docs/application/pdf/2020-05/cp200058it.pdf
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=COM:2020:825:FIN&from=en
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/
https://www.brookings.edu/blog/up-front/2019/04/09/how-big-is-the-problem-of-tax-evasion/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=71720872