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