https://www.socialeurope.eu/2017/07/imfs-approval-principle-greeces-third-program-depth-look/
https://ukandeu.ac.uk/what-sunaks-tax-return-tells-us-about-the-uk-tax-system/
http://www.ladocumentationfrancaise.fr/var/storage/rapports-publics/174000710.pdf
https://www.cbo.gov/system/files/115th-congress-2017-2018/reports/53651-outlook.pdf