https://www.socialeurope.eu/corporate-taxation-financing-state-and-welfare
http://www.levyinstitute.org/pubs/wp_886.pdf
https://www.finance-watch.org/press-release/reaction-european-commission-proposes-approach-to-fiscal-rules-review/
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