https://www.economiesuisse.ch/de/print/pdf/node/48161
https://www.ips-journal.eu/topics/european-integration/europe-needs-to-spend-its-money-better-7243/
http://library.fes.de/pdf-files/bueros/rom/16042.pdf
https://www.imf.org/-/media/Files/Publications/REO/EUR/2022/April/English/text.ashx