UPTON, Brian G. J. The geology of Tugtutôq and neighbouring islands, South Greenland. Part IV: The nepheline syenites of the Hviddal composite dyke. Meddelelser om Grønland, [S. l.], v. 169, n. 3, p. 49–80, 1964. Disponível em: https://tidsskrift.dk/meddrgroenland/article/view/160425. Acesso em: 18 jan. 2026.