https://www.aspistrategist.org.au/the-eu-needs-fiscal-union/
http://www.case-research.eu/files/?id_plik=5223
https://data.consilium.europa.eu/doc/document/ST-6437-2022-INIT/fr/pdf
https://wiiw.ac.at/do-interest-growth-differentials-affect-fiscal-policy-evidence-for-advanced-economies-dlp-6694.pdf