https://theconversation.com/eu-enlargement-what-does-the-future-hold-227716
https://www.eppgroup.eu/download/file/t5F7fWVHAho9XFLF3fGb3HMHOc_fBpiq-JJIhg_2alGxibc6qNgf4Xn7KKgAAAACEQU0OTEyMw
https://multinationales.org/IMG/pdf/pfuesousinfluence.pdf
http://cer.eu/sites/default/files/report_relaunching_eu_nov17.pdf