KNUDSEN, Christian; PENAYE, Joseph; MEHLSEN, Martin; MCLIMANS, Roger K; KALSBEEK, Feiko. Titanium minerals in Cameroon. GEUS Bulletin, Copenhagen, Denmark, v. 28, p. 73–76, 2013. DOI: 10.34194/geusb.v28.4729. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4729. Acesso em: 14 oct. 2025.