Friend, P. F., P. D. Alexander-Marrack, J. Nicholson, and A. K. Yeats. “Devonian Sediments of East Greenland II. Sedimentary Structures and Fossils”. Meddelelser om Grønland 206, no. 2 (January 1, 1976): 91 pp. . Accessed December 6, 2025. https://tidsskrift.dk/meddrgroenland/article/view/143410.