Krell, Dominik MPI for Comparative and International Private Law, Max Planck Society;
http://www.kfcris.com/en/view/post/193 (Any fulltext)
Krell, D. (2018). The Challenges of Codifying Islamic Law, KFCRIS Commentaries, King Faisal Center for Research and Islamic Studies in Riyadh. KFCRIS Commentaries.