
https://www.publico.pt/2020/07/15/politica/opiniao/valores-nao-negoceiam-sao-objeto-compra-venda-1924561

http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech976.pdf

https://blogs.lse.ac.uk/europpblog/2023/12/11/new-hopes-for-the-eu-enlargement-process/