https://www.esrb.europa.eu/pub/pdf/wp/esrbwp21.en.pdf
https://www.socialeurope.eu/the-frugal-four-should-save-the-european-project
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-2019-na74-reduire-depenses-publiques-gouardo-lenglart-janvier.pdf
https://www.imk-boeckler.de/download-proxy-for-faust/download-pdf?url=http%3A%2F%2F217.89.182.78%3A451%2Fabfrage_digi.fau%2Fp_imk_report_152e_2020.pdf%3Fprj%3Dhbs-abfrage%26ab_dm%3D1%26ab_zeig%3D8849%26ab_diginr%3D8482