http://www.votewatch.eu/blog/alliances-matter-political-networks-the-rule-of-law-principles-and-the-split-of-eu-money-mff/
https://www.bancaditalia.it/media/approfondimenti/2019/pop-bari/approfondimenti-popBari.pdf
https://www.ipg-journal.de/regionen/europa/artikel/detail/macht-statt-moral-3554/