Soen, Oen Ing, and Hans Pauly. “A Sulphide Paragenesis With Pyrrhotite and Marcasite in the Siderite-Cryolite Ore of Ivigtut, South Greenland”. Meddelelser om Grønland 175, no. 5 (February 4, 1967): 67 pp. Accessed December 28, 2025. https://tidsskrift.dk/meddrgroenland/article/view/156544.