Lam, Jørgen, and K. Raunsgaard Pedersen. “Precambriam Organic Compounds from the Ketilidian of South-West Greenland, Part II”. Meddelelser Om Grønland, vol. 185, no. 6, Apr. 1968, p. 16 pp., https://tidsskrift.dk/meddrgroenland/article/view/152389.