https://carnegieendowment.org/files/2-24_Lehne-EU_Geopolitics.pdf
https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier
http://visegradinsight.eu/app/uploads/2019/11/EaP-2030-Trends.pdf
https://ecipe.org/wp-content/uploads/2024/05/ECI_24_PolicyBrief_11-2024_LY05.pdf