http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech1001.pdf
https://www.esri.ie/system/files/publications/QEC2022WIN_0.pdf
https://www.riksbank.se/en-gb/press-and-published/notices-and-press-releases/debate-articles/payments-in-the-future-and-legal-protection-for-the-swedish-krona/
https://www.ilriformista.it/come-litalia-ha-drogato-leconomia-dagli-anni-70-cosi-la-crescita-rimane-un-miraggio-415786/