http://ec.europa.eu/finance/docs/law/171011-communication-banking-union_en.pdf
https://www.boeckler.de/pdf/p_wsi_report_52_2019.pdf
https://www.suerf.org/docx/f_ec43638b66e16a5bbede9b710b12b0c7_32333_suerf.pdf
https://www.occrp.org/en/daily/12149-denmark-will-not-give-aid-to-companies-registered-in-tax-havens