Eva T.H. Ran, Sjoerd J.P. Bohncke, and J. Vandenberghe. “Evidence of Episodic Permafrost Conditions During the W Eichselian Middle Pleniglacial in the Hengelo Basin (The Netherlands)”. Netherlands Journal of Geosciences (January 1, 1990): 207-218. Accessed April 2, 2026. https://njgjournal.nl/index.php/njg/article/view/12864.