Petersen, Henrik I., Jan Andsbjerg, Jørgen A. Bojesen-Koefoed, Hans P. Nytoft, and Per Rosenberg. “Petroleum Potential and Depositional Environments of Middle Jurassic Coals and Non-Marine Deposits, Danish Central Graben, With Special Reference to the Søgne Basin”. GEUS Bulletin 36 (August 18, 1998): 1-80. Accessed December 3, 2020. https://geusbulletin.org/index.php/geusb/article/view/5022.