“Chemical Analyses of Igneous and Metamorphic Rocks of Denmark, the Faeroes and Greenland. (To and Including 1940)”. Danmarks Geologiske Undersøgelse II. Række 68 (December 31, 1942): 1–105. Accessed December 1, 2025. https://geusjournals.org/index.php/raekke2/article/view/6857.