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: https://ikcabstracts.com/index.php/ikc/article/view/3692. Acesso em: 18 jun. 2021.