D.J. Huisman, J.P. Weijers, L. Dijkshoorn, and A. Veldkamp. “Spatial Prediction of the Variability of Early Pleistocene Subsurface Sediments in the Netherlands - Part 2: Geochemistry”. Netherlands Journal of Geosciences 79 (December 1, 2000): pp. 381 - 390. Accessed April 5, 2026. https://njgjournal.nl/index.php/njg/article/view/11266.