GURNEY, J.J.; HOBBS, J.B.M. Potassium, thorium and uranium in some kimberlites from South Africa. International Kimberlite Conference: Extended Abstracts, [S. l.], v. 1, p. 143–146, 1973. DOI: 10.29173/ikc869. Disponível em: https://ikcabstracts.com/index.php/ikc/article/view/869. Acesso em: 20 apr. 2024.