Fortey, R. and Peel, J. 1989. Stratigraphy and hystricurid trilobites of the Christian Elv Formation (Lower Ordovician) of western North Greenland. Rapport Grønlands Geologiske Undersøgelse. 144, (Dec. 1989), 5–15. DOI:https://doi.org/10.34194/rapggu.v144.8058.