https://www.socialeurope.eu/the-german-debt-brake-reform-urgent
https://blogs.lse.ac.uk/brexit/2019/12/03/a-missed-opportunity-revisiting-the-euro-referendum-that-never-was-from-a-historical-perspective/
https://www.riksbank.se/sv/press-och-publicerat/nyheter-och-pressmeddelanden/pressmeddelanden/2019/reporantan-hojs-till-noll-procent/
https://www.boeckler.de/pdf/p_imk_report_139_2018.pdf