Röthel, Anne MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Guardianship_of_Adults (Any fulltext)
Röthel, A. (2012). Guardianship of Adults. In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 808-810). Oxford: Oxford University Press.