Binzer, K., and S. Karup-Møller. “Ferri-Sepiolite in Hydrothermal Calcite-Quartz-Chalcedony Veins on Nûgssuaq in West Greenland”. Bulletin Grønlands Geologiske Undersøgelse, vol. 114, Nov. 1974, pp. 1-16, doi:10.34194/bullggu.v114.6655.