
https://www.corriere.it/politica/22_novembre_18/di-maio-nuova-vita-sara-inviato-speciale-ue-golfo-persico-trattare-prezzo-petrolio-gas-0805b148-6720-11ed-b05a-06c1012dfe21.shtml

https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf

https://www.socialeurope.eu/2017/06/eurozones-hidden-strength/