Koch, B.E. “Fossil Picrodendroid Fruit from the Upper Danian of Nûgssuaq, West Greenland”. Bulletin Grønlands Geologiske Undersøgelse 98 (June 26, 1972): 1–33. Accessed July 3, 2024. https://geusjournals.org/index.php/bullggu/article/view/6639.