Petersen, H. I., J. Andsbjerg, J. A. Bojesen-Koefoed, H. P. Nytoft, and P. 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, vol. 36, Aug. 1998, pp. 1-80, doi:10.34194/dgub.v36.5022.