https://www.socialeurope.eu/reform-of-eu-fiscal-rules-more-ambition-needed
https://www.piie.com/blogs/realtime-economics/if-markets-are-right-about-long-real-rates-public-debt-ratios-will
https://www.boeckler.de/pdf/p_imk_report_125e_2017.pdf
https://socialeurope.eu/the-left-must-embrace-fiscal-restructuring