https://visegradinsight.eu/more-visible-europe-union-eu-germany/
https://carnegieendowment.org/files/2-24_Lehne-EU_Geopolitics.pdf
https://visegradinsight.eu/perfect-storm-covid19-eurosceptic-poland-hungary/
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.34.2.172
https://ec.europa.eu/commission/presscorner/detail/ov/SPEECH_20_1655
https://www.kas.de/de/veranstaltungsberichte/detail/-/content/vom-mauerfall-zur-migrationsfrage-30-jahre-deutsche-einheit-und-die-einheit-in-europa
https://ec.europa.eu/info/sites/info/files/strategic_foresight_report_2020_1.pdf
https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/
https://www.brookings.edu/blog/order-from-chaos/2020/08/17/hard-road-back-to-power-for-germanys-social-democrats/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=93515734&utm_source=hs_email
https://visegradinsight.eu/distant-liaisons-france-central-europe/