BARRETT, D.R.; BERG, G.W. Complementary petrographic and strontium-isotope ratio studies of South African kimberlites. International Kimberlite Conference: Extended Abstracts, [S. l.], v. 1, p. 27–30, 1973. DOI: 10.29173/ikc838. Disponível em: https://ikcabstracts.com/index.php/ikc/article/view/838. Acesso em: 3 may. 2024.