https://www.imf.org/external/pubs/ft/fandd/2021/12/pdf/Kimball.pdf
https://apnews.com/article/pandemic-fraud-waste-billions-small-business-labor-fb1d9a9eb24857efbe4611344311ae78
https://theconversation.com/la-popular-y-no-academica-filosofia-del-flamenco-228251
http://neilcummins.com/tie_cog.pdf