Elemente einer Theorie der Verfassung Europas
- International and Comparative Law
2001
“There is Nothing More Practical than a Good Theory: an Overview of contemporary Approaches to International Law”
- International and Comparative Law
German Yearbook of International Law
2001
Review of Die Europäische Union im Legitimationstrilemma: Zur Rechtfertigung des Regierens jenseits der Staatlichkeit
- International and Comparative Law
Common Market Law Review
2001