HELMSTAEDT, H.; GURNEY, L.J. Kimberlites of southern Africa - are they related to subduction processes?. International Kimberlite Conference: Extended Abstracts, [S. l.], v. 3, p. 272–273, 1982. DOI: 10.29173/ikc2383. Disponível em: https://journals.library.ualberta.ca/ikcabstracts.com/index.php/ikc/article/view/2383. Acesso em: 19 dec. 2025.