https://www.unodc.org/res/wdr2021/field/V2104298_Spanish.pdf
http://www2.assemblee-nationale.fr/documents/notice/15/rap-info/i0611/(index)/rapports-information
https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-5899.13082
https://www.transparency.org/en/news/how-cpi-scores-are-calculated