https://www.economiesuisse.ch/de/artikel/gut-so-trotz-zinspause-wird-die-geldpolitik-straffer
https://www.brookings.edu/wp-content/uploads/2018/04/es_20180416_digitalcurrencies.pdf
https://onlinelibrary.wiley.com/doi/10.1111/ecaf.12565
https://www.bancaditalia.it/pubblicazioni/quaderni-storia/2020-0046/QSE-46.pdf