SØRENSEN, H. M.; PETERSEN, Ole V. On the Mineralogy and Paragenesis of Tugtupite Na8Al2Be2Si8O24(Cl, S)2. Meddelelser om Grønland, [S. l.], v. 181, n. 13, p. 57 pp., 1971. Disponível em: https://tidsskrift.dk/meddrgroenland/article/view/153142. Acesso em: 28 dec. 2025.