https://www.ips-journal.eu/topics/european-integration/uniting-europes-distant-family-6734/
http://www.ladocumentationfrancaise.fr/pages-europe/pe000071-interrogations-sur-l-avenir-de-la-politique-de-cohesion-apres-2020-par-marjorie-jouen/article
https://www.global-counsel.co.uk/sites/default/files/analysis/insight/download/Hard%20and%20Soft%20Political%20Risk.pdf