APPEL, P. W.; JØNSSON, J. B. Borax – an alternative to mercury for gold extraction by small-scale miners: introducing the method in Tanzania. GEUS Bulletin, Copenhagen, Denmark, v. 20, p. 87–90, 2010. DOI: 10.34194/geusb.v20.4988. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4988. Acesso em: 5 may. 2024.