https://www.courthousenews.com/eu-must-act-quickly-to-catch-up-to-us-warns-report-author/
http://gabriel-zucman.eu/files/AJZ2017.pdf
https://www.investigate-europe.eu/posts/congo-brazzaville-european-oil-companies-petronor-perenco-secret-interests-with-ruling-family
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf