https://www.socialeurope.eu/the-frugal-four-should-save-the-european-project
https://open.overheid.nl/documenten/ronl-48b77cf7bdf0f91d4ed394ca2a37d2041bc50647/pdf
https://documents1.worldbank.org/curated/en/099152301082423951/pdf/IDU10e3b5c3c1eb9214f981ad6116416052537cd.pdf
https://wiiw.ac.at/fighting-depreciation-and-inflationary-pressures-dlp-6733.pdf