https://www.brookings.edu/articles/why-the-founders-cared-about-trade-and-taxes/
http://library.fes.de/pdf-files/bueros/rom/16042.pdf
https://www.socialeurope.eu/2017/06/eurozones-hidden-strength/
https://www.corriere.it/esteri/20_aprile_05/fondo-la-rinascita-f591fe90-775d-11ea-9a9a-6cb2a51f0129.shtml