Dybkjær, Karen. “Palynological Zonation and Palynofacies Investigation of the Fjerritslev Formation (Lower Jurassic - Basal Middle Jurassic) in the Danish Subbasin”. Danmarks Geologiske Undersøgelse Serie A 30 (December 31, 1991): 1–150. Accessed May 5, 2024. https://geusjournals.org/index.php/seriea/article/view/7050.