Vejbæk, Ole V, Torben Bidstrup, Peter Britze, Mikael Erlström, Erik S Rasmussen, and Ulf Sivhed. 2007. “Chalk Depth Structure Maps, Central to Eastern North Sea, Denmark”. GEUS Bulletin 13 (October). Copenhagen, Denmark:9-12. https://doi.org/10.34194/geusb.v13.4962.