Ineson, J. R., J. S. Peel, S. Willman, E. J. Rugen, M. Sønderholm, and P. Frykman. “Lithostratigraphy of the Portfjeld Group (Ediacaran – Lowermost Cambrian) of North Greenland”. GEUS Bulletin, vol. 57, Oct. 2024, doi:10.34194/geusb.v57.8375.