“Ferri-Sepiolite in Hydrothermal Calcite-Quartz-Chalcedony Veins on Nûgssuaq in West Greenland”. Bulletin Grønlands Geologiske Undersøgelse 114 (November 26, 1974): 1–16. Accessed November 10, 2025. https://geusjournals.org/index.php/bullggu/article/view/6655.