Hopt, Klaus J. MPI for Comparative and International Private Law, Max Planck Society;
https://www.wiso-net.de:443/document/HB__13F3BA36-591C-48B2-960C-DEFDB9373A9A%7CHBPM__13F3BA36-591C-48B2-960C-DEFDB9373A9A (全文テキスト(全般))