https://data.oecd.org/natincome/net-lending-borrowing-by-sector.htm
https://www.ips-journal.eu/index.php?id=340&L=0&tx_news_pi1%5Bnews%5D=3950&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Baction%5D=detail&utm_source=newsletter&utm_medium=email&utm_campaign=en_737_20191231&cHash=951ba3d83db8a5766c75dc246e3d2c7b
https://www.tandfonline.com/doi/full/10.1080/09692290.2022.2107043
https://www.bancaditalia.it/pubblicazioni/quaderni-storia/2020-0046/QSE-46.pdf