H. J. A. Berendsen and W. H. Zagwijn (1984) “Some conclusions reached at the symposium on geological changes in the Western Netherlands during the period 1000-1300 AD”, Netherlands Journal of Geosciences, pp. 225-229. Available at: https://njgjournal.nl/index.php/njg/article/view/13308 (Accessed: 31March2026).