https://www.d-kart.de/en/blog/2020/05/11/ultra-vires/
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-rapport-loi-pacte-20decembre-2019.pdf
http://www.ips-journal.eu/in-focus/migration-and-the-european-left/article/show/turn-left-the-other-left-2179/
https://www.transcrime.it/wp-content/uploads/2021/09/Datacros_report.pdf