M. Lootens. “Heavy Minerals As a Stratigraphical Tool for the Eemian and Post-Eemian Deposits in the Lower Lys Valley (Belgium)”. Netherlands Journal of Geosciences (January 1, 1987): 139-145. Accessed April 6, 2026. https://njgjournal.nl/index.php/njg/article/view/13099.