Dybkjær, K. (1991) “Palynological zonation and palynofacies investigation of the Fjerritslev Formation (Lower Jurassic - basal Middle Jurassic) in the Danish Subbasin”, Danmarks Geologiske Undersøgelse Serie A. Copenhagen, Denmark, 30, pp. 1–150. doi: 10.34194/seriea.v30.7050.