Zimmermann, Reinhard MPI for Comparative and International Private Law, Max Planck Society;
Zimmermann, R., & Johnston, D. (2002). Unjustified Enrichment: surveying the landscape. In D. Johnston, & R. Zimmermann (Eds.), Unjustified Enrichment: Key Issues in Comparative Perspective (pp. 3-33). Cambridge: Cambridge University Press.
