| published in: | FS Möschel, Baden-Baden, Nomos, pp. 227-240, 2011. |
| published in: | Competition Policy and the Economics Approach, Cheltenham, pp. 245-269, 2011. |
| published in: | Telecommunications Policy, vol. 31, pp. 530-540, 2007. |
| published in: | EU Competition Policy Fifty Years Onward After the Treaty, Oxford, Oxford University Press, pp. 203-235, 2009. |
| published in: | Deutschsprachige Zivilrechtslehrer des 20. Jahrhunderts in Berichten ihrer Schüler, vol. 2, Berlin, De Gruyter, pp. 53-69, 2010. |
| published in: | Journal of Competition Law and Economics, vol. 3, pp. 491-549, 2007. |
| published in: | Private Enforcement of EC Competition Law, Den Haag, Kluwer Law International, pp. 121-159, 2007. |
| published in: | Common Goods: Law, Politics and Economics, vol. 7, Baden-Baden, Nomos, pp. 101, 2002. |
| published in: | Recht und spontane Ordnung. Festschrift für Ernst-Joachim Mestmäcker zum 80. Geburtstag, Baden-Baden, Nomos, pp. 155-198, 2006. |