Bollingberg, H, and O.V Petersen. “Genthelvite from the Ilímaussaq Alkaline Intrusion, South Greenland”. Bulletin Grønlands Geologiske Undersøgelse 68 (November 3, 1967): 1–9. Accessed July 3, 2024. https://geusjournals.org/index.php/bullggu/article/view/6602.