https://bdi.eu/#/artikel/news/europa-muss-ein-worst-case-szenario-verhindern/
http://www.conservativegroupforeurope.org.uk/wordpress/wp-content/uploads/2017/09/Keeping-the-bridges-open-a-CGE-Policy-Options-Paper-.pdf
https://ec.europa.eu/commission/sites/beta-political/files/joint_report.pdf
https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-ongoing-police-and-judicial-cooperation-criminal-matters_en