Engel, Christoph Max Planck Institute for Research on Collective Goods, Max Planck Society;
Engel, C., & Einhorn, T. (2003). Imposed Liberty and its Limits. The EC Treaty as an Economic Constitution for the Member States. In Spontaneous Order, Organization and the Law. Roads to a European Civil Society. Liber Amicorum Ernst-Joachim Mestm (pp. 429-437). The Hague: Asser Press.