Upton, Brian G. J. “The Geology of Tugtutôq and Neighbouring Islands South Greenland, Part II. Nordmarkitic Syenites and Related Alkaline Rocks”. Meddelelser om Grønland 169, no. 2 (June 18, 1964): 1–62. Accessed December 28, 2025. https://tidsskrift.dk/meddrgroenland/article/view/160423.