https://worldjusticeproject.org/rule-of-law-index/downloads/INDEX_2022-digital.pdf
http://ftp.zew.de/pub/zew-docs/dp/dp20002.pdf
http://wir2018.wid.world/files/download/wir2018-summary-spanish.pdf
https://ec.europa.eu/commission/sites/beta-political/files/aviation.pdf