Raunsgaard Pedersen, K., and Jørgen Lam. “Precambriam Organic Compounds from the Ketilidian of South-West Greenland, Part I”. Meddelelser Om Grønland, vol. 185, no. 5, Feb. 1968, p. 16 pp., https://tidsskrift.dk/meddrgroenland/article/view/152390.