https://www.europarl.europa.eu/RegData/etudes/BRIE/2022/729299/EPRS_BRI(2022)729299_EN.pdf
https://www.somo.nl/wp-content/uploads/2021/06/ViacomCBS.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/769/769.pdf
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