1. Barca. (2009). An agenda for a reformed cohesion policy: A place-based approach to meeting European Union challenges and expectations (Independent report prepared at the request of Danuta Hübner, Commissioner for Regional Policy). http://ec.europa.eu/regional_policy/policy/future/barca_en.htm
2. Democracy across Borders
3. Coatleven, L., Hublet, F. & Rospars, T. (2020) Covid-19 et gestion de crise subsidiaire. Perspectives transfrontalières à la lumière du fédéralisme allemand, Groupe d’études géopolitiques. https://legrandcontinent.eu/fr/2020/12/07/gestion-de-crise-subsidiaire/. For English see: Subsidiary crisis management in the COVID-19 pandemic: Germany’s federalist experiment in transborder perspective. Available at: https://legrandcontinent.eu/fr/evenements/subsidiary-crisis-management-in-the-covid-19-pandemic/