KALVIG, P.; CLAUSEN, R. J.; FOLD, N.; HANGHØJ, K. To what extent is Denmark vulnerable to mineral supply shortage?. GEUS Bulletin, Copenhagen, Denmark, v. 31, p. 95–98, 2014. DOI: 10.34194/geusb.v31.4672. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4672. Acesso em: 30 jun. 2022.