Frykman, P. “Cambro–Ordovician Rocks of C. H. Ostenfeld Nunatak, Northern East Greenland”. Rapport Grønlands Geologiske Undersøgelse 91 (December 31, 1979): 125–132. Accessed November 27, 2024. https://geusjournals.org/index.php/rapggu/article/view/7632.