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

http://www.cesifo-group.de/portal/page/portal/DocBase_Service/studien/Studie-2017-Felbermayr-etal-Brexit-79843.pdf

http://www.votewatch.eu/blog/alliances-matter-political-networks-the-rule-of-law-principles-and-the-split-of-eu-money-mff/