Knudsen, Christian, Dirk Frei, Thomas Rasmussen, Erik S. Rasmussen, and Roger McLimans. “New Methods in Provenance Studies Based on Heavy Minerals: An Example from Miocene Sands in Jylland, Denmark”. GEUS Bulletin 7 (July 29, 2005): 29–32. Accessed May 25, 2022. https://geusbulletin.org/index.php/geusb/article/view/4827.