Persoz, F, E Larsen, and K Singer. “Helium in the Thermal Springs of Ûnartoq, South Greenland”. Rapport Grønlands Geologiske Undersøgelse 44 (January 1, 1972): 1–21. Accessed July 3, 2024. https://geusjournals.org/index.php/rapggu/article/view/7284.