
https://ec.europa.eu/commission/publications/terms-reference-article-50-treaty-european-union-negotiations_en

http://www.mfa.gov.pl/en/news/they_wrote_about_us/szymanski__we_hope_for_a_dialogue_free_of_stereotypes_between_france_and_central_europe_

https://wiiw.ac.at/keeping-friends-closer-why-the-eu-should-address-new-geoeconomic-realities-and-get-its-neighbours-back-in-the-fold-dlp-6487.pdf