Rasmussen, Erik S., Karen Dybkjær, and Stefan Piasecki. “The Billund Delta: A Possible New Giant Aquifer in Central and Western Jutland”. GEUS Bulletin 4 (July 20, 2004): 21–24. Accessed August 14, 2022. https://geusbulletin.org/index.php/geusb/article/view/4773.