Schiøler, Poul, Jan Andsbjerg, Ole R Clausen, Gregers Dam, Karen Dybkjær, Lars Hamberg, Claus Heilmann-Clausen, et al. “Lithostratigraphy: Rogaland Group, Formations: Sele, Fur and Balder”. GEUS Bulletin 12 (June 29, 2007): 46–57. Accessed October 21, 2025. https://geusbulletin.org/index.php/geusb/article/view/4935.