The colour and luminescence of tugtupite (beryllosodalite) from Ilímaussaq. Bulletin Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 95, p. 2–12, 1971. DOI: 10.34194/bullggu.v95.6636. Disponível em: https://geusjournals.org/index.php/bullggu/article/view/6636. Acesso em: 11 nov. 2025.