Nyssen, Jan, Jasper Van Nieuland, Dimitri Vandenberghe, Jérôme Juilleret, and Birgit Terhorst. “Grèzes litées and Their Genesis: The Site of Enscherange in the Rhenish- Ardennes Massif As a Case Study”. DIE ERDE – Journal of the Geographical Society of Berlin 147, no. 1 (March 22, 2016): 1-14. Accessed June 28, 2022. https://www.die-erde.org/index.php/die-erde/article/view/251.