Sheldon, Emma, et al. “Calcareous Nannofossil and Foraminifer Biostratigraphy of the Campanian–Maastrichtian Chalk of the Femern Bælt (Denmark–Germany)”. GEUS Bulletin, vol. 31, June 2014, pp. 31-34, https://doi.org/10.34194/geusb.v31.4647.