Friend, P. F., Alexander-Marrack, P. D., Allen, K. C., Nicholson, J., & Yeats, A. K. (1983). Devonian sediments of East Greenland VI. Review of results. Meddelelser Om Grønland, 206(6), 96 pp. Hentet fra https://tidsskrift.dk/meddrgroenland/article/view/141484