https://www.ifo.de/DocDL/EEAG-2019-executive-summary.pdf
https://www.hesa.ac.uk/data-and-analysis/publications/finances-2015-16/introduction
https://www.socialeurope.eu/2017/06/mercron-franco-german-tandem-back-berlins-terms/
https://wiiw.ac.at/the-euro-area-s-achilles-heel-reassessing-italy-s-long-decline-in-the-context-of-european-integration-and-globalisation-dlp-6622.pdf