Siehr, Kurt MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Family_Law_(International) (Any fulltext)
Siehr, K. (2012). Family Law (International). In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 681-686). Oxford: Oxford University Press.