https://www.bancaditalia.it/pubblicazioni/quaderni-storia/2020-0046/QSE-46.pdf
https://www.bancaditalia.it/compiti/riserve-portafoglio-rischi/cis/Presentazione_CIS_5.07.2021.pdf?language_id=1
http://library.fes.de/pdf-files/bueros/rom/16042.pdf
https://www.project-syndicate.org/commentary/quantitative-easing-has-fueled-financial-instability-by-robert-skidelsky-2021-09?utm_source=newsletter&utm_medium=email&utm_campaign=15%2F09%2F21