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- The enforceability of subsidiarity in the EU and the ethos of cooperative federalism : a comparative law perspective. -- In: European public law -- ISSN 1354-3725. -- Vol. 22 (2016), no. 2, s. 305-332.
- In the Name of Cooperation : The External Relations of the German Länder and Their Participation in the EU Decision-Making. -- In: European constitutional law review -- ISSN 1574-0196. -- Vol. 6, (2010), no. 1, s. 59-83.