https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf
https://blogs.lse.ac.uk/brexit/2021/02/26/future-british-european-security-relations-are-a-matter-of-trust/
https://es.insightcrime.org/noticias/balance-insight-crime-dhomicidios-en-2022/