https://www.censis.it/sites/default/files/downloads/La%20societaitaliana_2021.pdf
https://www.imf.org/-/media/Files/Publications/WP/2021/English/wpiea2021021-print-pdf.ashx
http://www.euronews.com/2017/06/09/catalonia-announces-independence-referendum?utm_source=newsletter&utm_medium=en&utm_content=catalonia-announces-independence-referendum&_ope=eyJndWlkIjoiZjU3Y2JhYmUwMGUxZDFiNTUxOTU1ZDljNzExNTI1MmEifQ==
https://irpimedia.irpi.eu/cprspa-roma-torino-multinazionale-ors/