https://www.esri.ie/system/files/publications/SUSTAT123_2.pdf
https://data.consilium.europa.eu/doc/document/ST-6437-2022-INIT/fr/pdf
https://www.brookings.edu/blog/up-front/2018/07/12/as-trump-twists-natos-arm-lets-run-the-math-on-defense-spending/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=64421876
https://www.economiesuisse.ch/de/artikel/ohne-schuldenbremse-droht-die-schuldenspirale