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”. Geology of Denmark Survey Bulletin, vol. 36, Aug. 1998, pp. 1-80, doi:10.34194/dgub.v36.5022.