https://rm.coe.int/fourth-evaluation-round-corruption-prevention-in-respect-of-members-of/1680a1963f
https://www.occrp.org/en/biometric-bribery-semlex/the-optimist-without-borders-inside-the-semlex-ceos-empire-of-influence
https://www.elibrary.imf.org/view/books/082/465808-9781513595603-en/ch002.xml
http://ecipe.org/app/uploads/2018/04/DTRI-final1.pdf