Hopt, Klaus J. MPI for Comparative and International Private Law, Max Planck Society;
European Corporate Governance Institute (ECGI) – Law Working Paper No. 286/2015 (Any fulltext)
Hopt, K. J. (2018). Groups of Companies: A Comparative Study on the Economics, Law and Regulation of Corporate Groups. In J. N. Gordon, & W.-G. Ringe (Eds.), The Oxford Handbook of Corporate Law and Governance (pp. 603-633). Oxford: Oxford University Press.