Friend, P. F., Alexander-Marrack, P. D., Nicholson, J., & Yeats, A. K. (1976). Devonian Sediments of East Greenland II. Sedimentary Structures and Fossils. Meddelelser Om Grønland, 206(2), 91 pp. . Hentet fra https://tidsskrift.dk/meddrgroenland/article/view/143410