https://www.socialeurope.eu/eu-enlargement-prospects-and-challenges
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.ifri.org/sites/default/files/atoms/files/ifri_holzhauser_alliance_bsw_2024.pdf
http://spinelligroup.eu/sites/spinelli/files/2018_manifesto_en.pdf