Mario L. Moura, and Salomon B. Kroonenberg. “Geochemistry of Quaternary Fluvial and Eolian Sediments in the Southeastern Netherlands”. Netherlands Journal of Geosciences (January 1, 1990): 359-373. Accessed May 21, 2026. https://njgjournal.nl/index.php/njg/article/view/12877.