https://www.taxjustice.net/wp-content/uploads/2020/11/The_State_of_Tax_Justice_2020_ENGLISH.pdf
https://ec.europa.eu/commission/sites/beta-political/files/aviation.pdf
https://www.sfo.gov.uk/2018/03/22/sfo-recovers-4-4m-from-corrupt-diplomats-in-chad-oil-share-deal/