Alsen, Peter, and Finn Surlyk. “Maximum Middle Jurassic Transgression in East Greenland: Evidence from New Ammonite Finds, Bjørnedal, Traill Ø”. GEUS Bulletin, vol. 5, Nov. 2004, pp. 31-49, https://doi.org/10.34194/geusb.v5.4806.