GURNEY, J.; HELMSTAEDT, H. Type IIa diamonds and their enhanced economic significance. International Kimberlite Conference: Extended Abstracts, [S. l.], v. 10, 2012. DOI: 10.29173/ikc3692. Disponível em: http://ikcabstracts.com/index.php/ikc/article/view/3692. Acesso em: 24 nov. 2020.