Wesselingh F.P., Janse A.C., Vervoenen M., and van Nieulande F.A.D. 2014. “New Records of Giant Campanilid Gastropods (Mollusca) from the Southern North Sea Basin: Implications for Eocene and Quaternary palaeogeography∙”. Netherlands Journal of Geosciences, March, 159-64. https://doi.org/10.1017/S0016774600000093.