https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.36.4.103
https://www.brookings.edu/blog/up-front/2018/07/12/as-trump-twists-natos-arm-lets-run-the-math-on-defense-spending/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=64421876
https://www.nuffieldtrust.org.uk/resource/getting-a-brexit-deal-that-works-for-the-nhs
https://www.levif.be/international/union-europeenne/le-parquet-europeen-sempare-enfin-de-la-plainte-belge-contre-von-der-leyen/