Petersen, H. I., L. H. Nielsen, E. B. Koppelhus, and H. S. Sørensen. “Early and Middle Jurassic Mires of Bornholm and the Fennoscandian Border Zone: A Comparison of Depositional Environments and Vegetation”. GEUS Bulletin, vol. 1, Oct. 2003, pp. 631-56, doi:10.34194/geusb.v1.4687.