https://ukandeu.ac.uk/the-rally-round-the-flag-effect-and-covid-19/#
http://www.pewglobal.org/2017/06/15/post-brexit-europeans-more-favorable-toward-eu/?cmpid=BBBXT061617_BIZ&utm_medium=email&utm_source=newsletter&utm
https://www.socialeurope.eu/wp-content/uploads/2019/09/Occ-Pap-14.pdf
https://apnews.com/article/spain-catalonia-puigdemont-amnesty-separatists-sanchez-7814a0f767f4358900a345c5826e731b