Keulen, Nynke, and Per Kalvig. “Fingerprinting of Corundum (ruby) from Fiskenæsset, West Greenland”. GEUS Bulletin 28 (July 10, 2013): 53–56. Accessed June 26, 2022. https://geusbulletin.org/index.php/geusb/article/view/4724.