Povarennykh, A. S., Platonov, A. M., Tarashchan, A. N., & Belichenko, V. P. (1971). The colour and luminiscence of Tugtupite (Beryllosodalite) from Ilímaussaq, South Greenland. Meddelelser Om Grønland, 181(14), 12 pp. Retrieved from https://tidsskrift.dk/meddrgroenland/article/view/153144