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
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/699106/UK_position_paper_on_future_of_cohesion_policy_.pdf
https://www.ilblogdellestelle.it/2020/02/la-mafia-va-contrastata-a-livello-europeo.html