A.A. Slupik, F.P. Wesselingh, A.C. Janse, and J.W.F. Reumer. “The Stratigraphy of the Neogene-Quaternary Succession in the Southwest Netherlands from the Schelphoek Borehole (42G4-11/42G0022) – a Sequence-Stratigraphic Approach”. Netherlands Journal of Geosciences, vol. 86, Dec. 2007, pp. 317-32, doi:10.1017/S0016774600023556.