https://www.boeckler.de/pdf/p_wsi_report_52_2019.pdf
https://www.dsgv.de/newsroom/presse/190912_PM_EZB_30.html
https://ec.europa.eu/commission/sites/beta-political/files/reflection-paper-emu_en.pdf
http://www.transparency.org/news/feature/europe_and_central_asia_an_overall_stagnation