Binzer, K., & Karup-Møller, S. (1974). Ferri-Sepiolite in Hydrothermal Calcite-Quartz-Chalcedony veins on Nûgssuaq in West Greenland. Meddelelser Om Grønland, 201(5), 21 pp. https://doi.org/10.7146/mog.v201.147419