J. Schokker, H.J.T. Weerts, W.E. Westerhoff, and C. den Otter. 2007. “Introduction of the Boxtel Formation and Implications for the Quaternary Lithostratigraphy of the Netherlands”. Netherlands Journal of Geosciences 86 (September):197 - 210. https://doi.org/10.1017/S0016774600077805.