https://www.fraserinstitute.org/sites/default/files/economic-freedom-of-the-world-2021.pdf
https://ad-aspi.s3.ap-southeast-2.amazonaws.com/2022-04/SR183%20AI%20Your%20questions%20answered.pdf?VersionId=xFT7Wh.VIHax8rp4Yu0UHAruP1.GYoqx
http://norden.diva-portal.org/smash/get/diva2:1095959/FULLTEXT02.pdf
http://www.ecb.europa.eu/pub/pdf/other/ebart201703_01.en.pdf