Soen, O.I., and Henning Sørensen. “Soen, O.I. & Sørensen, H. (1964): The Occurrence of Nickel-Arsenides and Nickel-Antimonide at Igdlúnguaq, in the Ilímaussaq Alkaline Massif”. Meddelelser Om Grønland, vol. 172, no. 1, Feb. 1964, pp. 1-59, https://tidsskrift.dk/meddrgroenland/article/view/158670.