https://www.foreignaffairs.com/united-states/economic-security-state-farrell-newman
https://ukandeu.ac.uk/wp-content/uploads/2020/03/Parliament-and-Brexit-report.pdf
http://www.iemed.org/observatori/arees-danalisi/arxius-adjunts/anuari/med.2018/IEMed_Crisis_EU_project_Medyearbook2018_Marc_Pierini.pdf