E. Kolstrup and T. A. Wijmstra (1977) “A palynological investigation of the Moershoofd, Hengelo, and Denekamp interstadials in the Netherlands”, Netherlands Journal of Geosciences, pp. 85-102. Available at: https://njgjournal.nl/index.php/njg/article/view/14292 (Accessed: 27April2026).